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Net Income (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income (loss) to common shareholders $ 126.4 $ (82.8) $ 141.6 $ (30.6)
Basic weighted average shares outstanding (in shares) 232.5 235.2 233.2 235.1
Diluted weighted average shares outstanding (in shares) 233.5 235.2 234.1 235.1
Net income (loss) per common share:        
Basic net income (loss) per share (in dollars per share) $ 0.54 $ (0.35) $ 0.61 $ (0.13)
Diluted net income (loss) per share (in dollars per share) $ 0.54 $ (0.35) $ 0.60 $ (0.13)
Antidilutive securities excluded from computation of earnings per share (in shares) 0.6 4.6 1.1 4.5