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Summary of Quarterly Results of Operations (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
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 247.9 $ 258.5 $ 302.4 $ 237.1 $ 244.1 $ 222.1 $ 183.5 $ 138.4 $ 1,045.9 $ 788.1 $ 451.2
Total operating expenses 176.1 302.8 225.8 178.2 195.3 132.0 149.1 239.4 882.9 715.8 414.4
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
Net income (loss) 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
Net income (loss) per share, 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
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
Weighted average common shares outstanding, 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