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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total revenues $ 311.1 $ 401.5 $ 373.6 $ 362.6 $ 381.4 $ 412.7 $ 444.5 $ 389.2 $ 1,448.8 $ 1,627.8 $ 1,725.3
Cost of product sales 28.8 33.0 26.7 29.1 31.9 51.9 61.7 53.2 117.6 198.7 105.7
Gross profit 282.3 368.5 346.9 333.5 349.5 360.8 382.8 336.0      
Net income (loss) $ 52.6 $ 132.4 $ 205.1 $ (494.6) $ 65.3 $ 106.5 $ 172.9 $ 244.5 $ (104.5) $ 589.2 $ 417.9
Net income (loss) per share-basic (in dollars per share) $ 1.20 $ 3.02 $ 4.68 $ (11.32) $ 1.50 $ 2.44 $ 4.01 $ 5.65 $ (2.39) $ 13.54 $ 9.50
Net income (loss) per share-diluted (in dollars per share) $ 1.20 $ 3.01 $ 4.66 $ (11.32) $ 1.48 $ 2.42 $ 3.98 $ 5.57 $ (2.39) $ 13.39 $ 9.31
STAP awards                      
Share-based compensation expense (benefit) charged to operating expenses, net of tax $ 5.6 $ 1.2 $ (46.0) $ 8.5 $ (10.3) $ 24.8 $ 2.1 $ (88.7) $ (30.7) $ (72.1) $ 17.1