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Stockholders' Equity - Level 4 Tag - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Feb. 07, 2018
Dec. 31, 2017
Dec. 31, 2019
Feb. 13, 2017
Dividends, Common Stock [Abstract]                
Dividends Payable, Date Declared May 14, 2020 Feb. 28, 2020            
Dividends Payable, Amount Per Share $ 0.075 $ 0.075            
Dividends Payable, Date of Record May 28, 2020 Mar. 13, 2020            
Dividends Payable, Date to be Paid Jun. 12, 2020 Mar. 30, 2020            
Payment, Tax Withholding, Share-based Payment Arrangement   $ 32.1 $ 33.1 $ 36.9        
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                
Preferred Stock, Shares Authorized 100.0   100.0       100.0  
Preferred Stock, Shares Issued 0.0   0.0       0.0  
Preferred Stock, Shares Outstanding 0.0   0.0       0.0  
Stock Repurchase Program, Authorized Amount               $ 300.0
Stock Repurchase Program, Period in Force         3 years      
Treasury Stock, Shares, Acquired           133.5    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 166.5   $ 166.5          
Dividend Declared [Member]                
Dividends, Common Stock [Abstract]                
Dividends, Common Stock, Cash 14.5 14.4            
Dividend Paid [Member]                
Dividends, Common Stock [Abstract]                
Dividends, Common Stock, Cash $ 14.3 $ 14.2            
Restricted Stock Units (RSUs) [Member]                
Dividends, Common Stock [Abstract]                
Vesting of restricted stock units   0.9            
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation   0.3            
Stock, Shares Issued Net of Shares for Tax Withholdings   0.6