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Earnings Per Share (Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income (loss) from continuing operations $ 239.5 $ (232.2)
Loss from discontinued operations, net of income taxes (0.1) (0.1)
NET INCOME (LOSS) $ 239.4 $ (232.3)
Basic weighted average common shares outstanding (in shares) 83.1 90.0
Dilutive effect of stock options and unvested RSUs (in shares) 0.8 0.0
Diluted weighted average common shares outstanding (in shares) 83.9 90.0
Basic earnings (loss) per share amounts:    
Continuing operations (in dollars per share) $ 2.88 $ (2.58)
Discontinued operations (in dollars per share) 0 0
Net income (loss) (in dollars per share) 2.88 (2.58)
Diluted earnings (loss) per share amounts:    
Continuing operations (in dollars per share) 2.85 (2.58)
Discontinued operations (in dollars per share) 0 0
Net income (loss) (in dollars per share) $ 2.85 $ (2.58)