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Accumulated Other Comprehensive Loss - Schedule of Changes in the Components of AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Changes in the components of AOCI    
Beginning balance $ 6,513.6 $ 5,894.8
Net other comprehensive loss (0.3) 4.0
Ending balance 6,831.3 5,977.9
Total    
Changes in the components of AOCI    
Beginning balance (4.1) (20.6)
Net other comprehensive loss (0.3) 4.0
Ending balance (4.4) $ (16.6)
Minimum Pension Liability    
Changes in the components of AOCI    
Beginning balance 11.0  
Net other comprehensive loss (0.3)  
Ending balance 10.7  
Foreign Currency    
Changes in the components of AOCI    
Beginning balance (15.1)  
Net other comprehensive loss 0.0  
Ending balance $ (15.1)