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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net income (loss) $ 132.4 $ 106.5 $ (157.1) $ 523.9
Denominator:        
Weighted average outstanding shares - basic (in shares) 43.9 43.6 43.8 43.5
Effect of dilutive securities:        
Stock options, restricted stock units and employee stock purchase plan (in shares) 0.1 0.4   0.5
Weighted average shares - diluted (in shares) 44.0 44.0 43.8 44.0
Net income (loss) per common share:        
Basic (in dollars per share) $ 3.02 $ 2.44 $ (3.59) $ 12.04
Diluted (in dollars per share) $ 3.01 $ 2.42 $ (3.59) $ 11.91
Stock options and restricted stock units excluded from calculation (in shares) 8.0 4.5 7.1 4.6