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Net Income (Loss) Per Unrestricted Share - Reconciliation of Numerator and Denominator Used in Calculation (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Net Income (Loss) $ 75.4 $ (97.1) $ 146.7 $ (177.2)
Weighted-Average Unrestricted Shares Outstanding (in shares) 64,395,000 64,008,500 64,324,700 63,977,700
Equity-based Compensation Equivalent Shares (in shares) 496,600 0 507,400 0
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution (in shares) 64,891,600 64,008,500 64,832,100 63,977,700
Basic Net Income (Loss) Per Unrestricted Share (in shares) $ 1.17 $ (1.52) $ 2.28 $ (2.77)
Diluted Net Income (Loss) Per Unrestricted Share (in shares) $ 1.16 $ (1.52) $ 2.26 $ (2.77)