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Earnings per Common Share - Reconciliation of Weighted Average Number of Shares Outstanding (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding (shares) 98.7 98.0 98.5 98.2
Restricted stock awards, dilutive stock options, and restricted stock units (shares) 1.2 1.3 1.1 1.3
Diluted weighted average common shares outstanding (shares) 99.9 99.3 99.6 99.5