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Net Income Per Unrestricted Share - Reconciliation of Numerator and Denominator Used in Calculation (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Net Income $ 126.1 $ 122.1 $ 190.1 $ 277.4
Dilutive Effect on Income of Equity-based Compensation Equivalent Shares 0.0 0.0 0.0 0.0
Diluted Net Income Attributed to Unrestricted Shares $ 126.0 $ 121.8 $ 189.9 $ 276.4
Weighted-Average Unrestricted Shares Outstanding (in shares) 65,257,600 65,408,100 65,886,800 65,113,200
Equity-based Compensation Equivalent Shares (in shares) 763,200 781,800 781,100 786,400
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution (in shares) 66,020,800 66,189,900 66,667,900 65,899,600
Basic (in dollars per share) $ 1.93 $ 1.87 $ 2.88 $ 4.25
Diluted (in dollars per share) $ 1.91 $ 1.84 $ 2.85 $ 4.20
Common Stock        
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Net Income $ 126.0 $ 121.8 $ 189.9 $ 276.4
Participating Awards        
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Net Income $ 0.1 $ 0.3 $ 0.2 $ 1.0