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Net Income Per Share - Schedule of Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]                      
Net income (loss) $ 347.9 $ (57.6) $ 79.6 $ 37.4 $ 34.0 $ 53.8 $ 51.3 $ (102.1) $ 407.3 $ 37.0 $ 21.1
Weighted-average common shares outstanding:                      
Basic (in shares) 93.5 93.3 93.0 92.6 92.2 91.9 91.4 91.1 93.1 91.6 90.2
Effect of dilutive securities:                      
Diluted (in shares) 97.2 93.3 98.2 97.0 97.2 96.1 94.8 91.1 97.8 95.7 95.4
Net income per share:                      
Basic (in USD per share) $ 3.72 $ (0.62) $ 0.86 $ 0.40 $ 0.37 $ 0.59 $ 0.56 $ (1.12) $ 4.38 $ 0.40 $ 0.23
Diluted (in USD per share) $ 3.58 $ (0.62) $ 0.81 $ 0.39 $ 0.35 $ 0.56 $ 0.54 $ (1.12) $ 4.16 $ 0.39 $ 0.22
2.25% Convertible Senior Notes                      
Effect of dilutive securities:                      
2024 Notes (in shares)                 1.8 1.1 1.3
Stock options                      
Effect of dilutive securities:                      
Effect of dilutive securities (in shares)                 2.4 2.6 3.2
Restricted stock units                      
Effect of dilutive securities:                      
Effect of dilutive securities (in shares)                 0.5 0.4 0.6