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Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]            
Net income (loss) $ 287.0 $ (76.0) $ 744.0 $ 226.0 $ 517.0 $ 1,170.0
Shares:            
Weighted average outstanding shares 66 67 66 67    
Equivalent shares from outstanding stock awards 1 1 1 1    
Denominator for diluted calculation 67 68 67 68    
Diluted earnings per share $ 4.29 $ (1.13) $ 11.06 $ 3.35    
Basic earnings per share $ 4.34 $ (1.13) $ 11.19 $ 3.38    
Net Income (Loss) Attributable to Noncontrolling Interest $ 2.0 $ 1.0 $ 5.0 $ 2.0 4.0  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 289.0 $ (75.0) $ 749.0 $ 228.0 $ 521.0