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Earnings Per Share (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-average shares outstanding – basic 108,700,000 109,100,000 109,500,000 109,000,000.0
Weighted-average shares outstanding – diluted 112,100,000 112,800,000 109,500,000 109,000,000.0
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount $ 0 $ 0 $ 3,400,000 $ 2,100,000
Stock Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 3,300,000 3,700,000 0 0
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount $ 0 $ 0 $ 3,300,000 $ 2,100,000
Share-based Payment Arrangement, Option        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 100,000 0 0 0
In-the-money Stock Options | Share-based Payment Arrangement, Option        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount $ 0 $ 0 $ 100,000 $ 0
Out-of-the-money Stock Options | Share-based Payment Arrangement, Option        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount $ 0 $ 0 $ 0 $ 0
Exercise Price Range, Greater Than Average Market Price        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding 200,000 900,000 200,000 900,000
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price $ 32.73 $ 27.97 $ 32.73 $ 27.97