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Earnings Per Share (Details) - shares
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items]    
Common Stock, Shares, Outstanding 94,400,000 102,500,000
Stock Repurchased and Retired During Period, Shares 2,690,292 1,260,163
Treasury Stock, Shares, Acquired 200,000 500,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]    
Weighted-average number of common shares outstanding - basic 96,000,000.0 102,300,000
Weighted-average number of common shares outstanding - diluted 97,500,000 102,300,000 [1]
Potentially dilutive shares excluded from computation of dilutive earnings per share 5,200,000 5,800,000
Stock options    
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]    
Incremental Common Shares Attributable to Share-based Payment Arrangements 200,000 0
Restricted stock units    
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]    
Incremental Common Shares Attributable to Share-based Payment Arrangements 1,300,000 0
[1]
(1)
Due to the net loss during the three months ended March 31, 2019, the denominator in the diluted earnings per share calculation does not include the effects of the stock awards for which the average market price for the period exceeds the exercise price, as it would result in a less dilutive computation. As a result, reported diluted earnings per share for the three months ended March 31, 2019 are the same as basic earnings per share.