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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Net income $ 190.6 $ 52.6 $ 155.5 $ 199.8 $ 512.1 $ (91.7) $ (40.1) $ 306.3 $ 598.6 $ 686.4 $ 1,534.3
Weighted average number of shares outstanding, basic 274,036,118 277,010,690 285,426,801 291,945,750 294,290,072 303,652,802 303,793,432 303,582,578 282,732,526 301,676,941 301,945,319
Effect of dilutive securities - stock based compensation awards                 2,738,538 1,619,671 1,722,350
Weighted Average Number of Shares Outstanding, Diluted 277,226,628 279,924,410 287,882,787 293,993,474 295,996,057 303,652,802 303,793,432 305,424,592 285,471,064 303,296,612 303,667,669
Net income per share: basic (in dollars per share) $ 0.70 $ 0.19 $ 0.55 $ 0.68 $ 1.74 $ (0.31) $ (0.13) $ 1.01 $ 2.12 $ 2.28 $ 5.08
Earnings Per Share, Diluted (in dollars per share) $ 0.69 $ 0.19 $ 0.54 $ 0.68 $ 1.73 $ (0.31) $ (0.13) $ 1.00 $ 2.10 $ 2.26 $ 5.05
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)                 2,234,500 2,645,750 0