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Accumulated Other Comprehensive Loss ("AOCL") - Components of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect $ (100.9)   $ (100.9)   $ (105.6)
Defined benefit plan liabilities 2.3   2.3   2.3
Accumulated other comprehensive loss (98.6)   (98.6)   (103.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance 684.3 $ 582.9 662.7 $ 344.1  
Other comprehensive loss before reclassifications       (3.4)  
Net amount reclassified to net income (loss) 1.5 1.7 4.7 4.9  
Ending balance 697.4 628.5 697.4 628.5  
Defined benefit plan liabilities          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect (102.1)   (102.1)   (107.0)
Defined benefit plan liabilities 2.6   2.6   2.6
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance (101.3) (99.5) (104.6) (99.4)  
Other comprehensive loss before reclassifications       (3.4)  
Net amount reclassified to net income (loss) 1.5 1.7 4.8 5.0  
Ending balance (99.8) (97.8) (99.8) (97.8)  
Unrealized gain on financial instruments          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect 1.2   1.2   1.4
Defined benefit plan liabilities (0.3)   (0.3)   $ (0.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance 1.2 1.4 1.3 1.5  
Other comprehensive loss before reclassifications       0.0  
Net amount reclassified to net income (loss) 0.0 0.0 (0.1) (0.1)  
Ending balance 1.2 1.4 1.2 1.4  
Accumulated other comprehensive loss          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance (100.1) (98.1) (103.3) (97.9)  
Ending balance $ (98.6) $ (96.4) $ (98.6) $ (96.4)