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Accumulated Other Comprehensive Loss ("AOCL") - Components of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect $ (101.9)   $ (100.2)
Defined benefit plan liabilities 2.3   2.3
Accumulated other comprehensive loss (99.6)   (97.9)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 355.6    
Other comprehensive loss before reclassifications (3.4)    
Net amount reclassified to net income (loss) 1.7 $ 1.1  
Ending balance 601.5    
Defined benefit plan liabilities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect (103.5)   (101.8)
Defined benefit plan liabilities 2.6   2.6
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (99.4) (95.6)  
Other comprehensive loss before reclassifications (3.4)    
Net amount reclassified to net income (loss) 1.8 1.2  
Ending balance (101.0) (94.4)  
Unrealized gain on financial instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect 1.6   1.6
Defined benefit plan liabilities (0.3)   $ (0.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 1.5 1.6  
Other comprehensive loss before reclassifications 0.0    
Net amount reclassified to net income (loss) (0.1) (0.1)  
Ending balance 1.4 1.5  
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (97.9) (94.0)  
Ending balance $ (99.6) $ (92.9)