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Accumulated Other Comprehensive Loss - Schedule of Changes in the Components of AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Changes in the components of AOCI                
Beginning balance $ 6,968.5 $ 6,831.3 $ 6,513.6 $ 6,103.1 $ 5,977.9 $ 5,894.8 $ 6,513.6 $ 5,894.8
Net other comprehensive loss (2.0) 1.6 (0.3) (5.9) 5.0 4.0 (0.7) 3.1
Ending balance 7,080.2 6,968.5 6,831.3 6,311.6 6,103.1 5,977.9 7,080.2 6,311.6
Total                
Changes in the components of AOCI                
Beginning balance (2.8) (4.4) (4.1) (11.6) (16.6) (20.6) (4.1) (20.6)
Net other comprehensive loss (2.0) 1.6 (0.3) (5.9) 5.0 4.0 (0.7)  
Ending balance (4.8) $ (2.8) (4.4) $ (17.5) $ (11.6) $ (16.6) (4.8) $ (17.5)
Minimum Pension Liability                
Changes in the components of AOCI                
Beginning balance     11.0       11.0  
Net other comprehensive loss             (0.7)  
Ending balance 10.3           10.3  
Foreign Currency                
Changes in the components of AOCI                
Beginning balance     $ (15.1)       (15.1)  
Net other comprehensive loss             0.0  
Ending balance $ (15.1)           $ (15.1)