XML 68 R56.htm IDEA: XBRL DOCUMENT v3.24.2.u1
Accumulated Other Comprehensive Loss ("AOCL") - Components of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect $ (100.4)   $ (100.4)   $ (100.2)
Defined benefit plan liabilities 2.3   2.3   2.3
Accumulated other comprehensive loss (98.1)   (98.1)   (97.9)
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance     355.6    
Net amount reclassified to net income (loss) 1.5 $ 2.2 3.2 $ 3.3  
Other comprehensive loss before reclassifications     (3.4)    
Ending balance 601.5   601.5    
Defined benefit plan liabilities          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect (101.8)   (101.8)   (101.8)
Defined benefit plan liabilities 2.6   2.6   2.6
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance (101.0) (94.4) (99.4) (95.6)  
Net amount reclassified to net income (loss) 1.5 2.2 3.3 3.4  
Other comprehensive loss before reclassifications     (3.4)    
Ending balance (99.5) (92.2) (99.5) (92.2)  
Unrealized gain on financial instruments          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect 1.4   1.4   1.6
Defined benefit plan liabilities (0.3)   (0.3)   $ (0.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance 1.4 1.5 1.5 1.6  
Net amount reclassified to net income (loss) 0.0 0.0 (0.1) (0.1)  
Other comprehensive loss before reclassifications     0.0    
Ending balance 1.4 1.5 1.4 1.5  
Accumulated other comprehensive loss          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Beginning balance (99.6) (92.9) (97.9) (94.0)  
Ending balance $ (98.1) $ (90.7) $ (98.1) $ (90.7)