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Components of Accumulated Other Comprehensive Loss - Components of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect $ (91.2)   $ (91.2)   $ (96.3)
Defined benefit plan liabilities 2.2   2.2   2.3
Accumulated other comprehensive loss (89.0)   (89.0)   (94.0)
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance     399.3    
Net amount reclassified to net income (loss) 1.7 $ (7.3) 5.0 $ (5.9)  
Ending balance 333.4   333.4    
Defined benefit plan liabilities          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect 1.7   1.7   (98.0)
Defined benefit plan liabilities 2.6   2.6   2.6
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance (92.2) (82.6) (95.6) (84.0)  
Net amount reclassified to net income (loss) 1.7 (7.3) 5.1 (5.9)  
Ending balance (90.5) (89.9) (90.5) (89.9)  
Unrealized gain on financial instruments          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect (92.9)   (92.9)   1.7
Defined benefit plan liabilities (0.4)   (0.4)   $ (0.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance 1.5 1.7 1.6 1.7  
Net amount reclassified to net income (loss) 0.0 0.0 (0.1) 0.0  
Ending balance 1.5 1.7 1.5 1.7  
Accumulated other comprehensive loss          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance (90.7) (80.9) (94.0) (82.3)  
Ending balance $ (89.0) $ (88.2) $ (89.0) $ (88.2)