Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Employee Benefits Plan - Awards (Details)

v3.10.0.1
Stock-Based Compensation and Employee Benefits Plan - Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 28, 2018
Feb. 17, 2017
Aug. 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proceeds from Stock Options Exercised $ 0.7 $ 7.9 $ 3.6      
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options (Deprecated 2017-01-31) $ 7.8 $ 11.9 $ 5.7      
Shares Issued upon Settlement of Executive Bonus Plan       300,000 200,000 200,000
Restricted Stock Unit and Restricted Stock Award [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 3,263,000 3,183,000        
Weighted-average grant date fair value per share $ 20.23 $ 20.13        
RSUs granted in period (shares) 2,460,000          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 19.40          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (1,736,000)          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share $ 18.64          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (644,000)          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Intrinsic Value $ 20.90          
Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Risk-free interest rate 2.76%          
Dividend yield 0.00% 0.00%        
Expected life (in years) 5 years 6 months          
Volatility 44.30%          
2010 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 12,800,027          
2004 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 553,710