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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Feb. 07, 2018
Dec. 31, 2017
Feb. 13, 2017
Common Stock, Dividends, Per Share, Declared   $ 0.075      
Stock Repurchase Program, Authorized Amount         $ 300.0
Stock Repurchase Program, Period in Force     3 years    
Treasury Stock, Shares, Acquired       133,500,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 166.5        
Preferred Stock, Shares Authorized 100,000,000.0 100,000,000      
Preferred Stock, Shares Issued 0 0      
Preferred Stock, Shares Outstanding 0 0      
Payment, Tax Withholding, Share-based Payment Arrangement $ 39.2 $ 1.2   $ 0.0  
Dividend Declared [Member]          
Dividends, Common Stock, Cash   42.6      
Dividend Paid [Member]          
Dividends, Common Stock, Cash   $ 41.6      
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 1,700,000        
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 600,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, shares issued in period, net of withholding taxes 1,100,000