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Summary of Significant Accounting Policies Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ 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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Net income (loss) $ 519.7 $ 246.0 $ 397.7 $ (604.8) $ 275.8 $ 202.8 $ 165.5 $ 412.2 $ 558.6 $ 1,056.4 $ 370.5
Net Income (Loss) Available to Common Stockholders, Basic                 558.6 1,056.4 370.5
Adjustment for interest expense incurred on assumed conversions of convertible notes                 0.0 0.0 3.1
Net Income (Loss) Available to Common Stockholders, Diluted                 $ 558.6 $ 1,056.4 $ 373.6
Weighted Average Number of Shares Issued, Basic [1]                 298,407,921 299,885,468 294,248,871
Effect of dilutive securities - stock based compensation awards                 490,752 1,342,247 1,398,329
Effect of dilutive securities - convertible senior notes                 0 0 5,368,876
Weighted Average Number of Shares Outstanding, Diluted 298,474,209 297,990,822 297,776,315 300,280,398 301,557,866 301,384,364 300,752,992 300,172,853 298,898,673 [1] 301,227,715 [1] 301,016,076 [1]
Net income (loss) per share: basic (in dollars per share) $ 1.74 $ 0.83 $ 1.34 $ (2.01) $ 0.92 $ 0.68 $ 0.55 $ 1.38 $ 1.87 $ 3.52 $ 1.26
Earnings Per Share, Diluted (in dollars per share) $ 1.74 $ 0.83 $ 1.34 $ (2.01) $ 0.91 $ 0.67 $ 0.55 $ 1.37 $ 1.87 $ 3.51 $ 1.24
Stockbased compensation awards [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Total anti-dulitive common share equivalents excluded from earnings per share computations (in shares)                 5,853,469 1,200,250 0
[1] In calculating earnings per share, accounting standards require that common shares owned by the Company's Employee Savings and Stock Ownership Plan that are as yet unallocated to participants in the plan be excluded from the calculation. Such shares are issued and outstanding, and have the same voting and other rights applicable to all other common shares.