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Debt - Senior Notes (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Mar. 07, 2024
Mar. 31, 2023
Debt Instrument [Line Items]        
Long-term debt $ 6,019.2 $ 6,019.2   $ 6,466.6
Debt instrument, unamortized discount 13.9 $ 13.9   10.4
Senior Indebtedness        
Debt Instrument [Line Items]        
Debt Instrument Redemption Price Percentage Change In Control Event   101.00%    
Senior Indebtedness | 5.050% 2029 Notes        
Debt Instrument [Line Items]        
Debt Instrument Redemption Price Percentage Change In Control Event   101.00%    
Long-term debt 1,000.0 $ 1,000.0   0.0
Debt issuance costs, gross     $ 2.3  
Debt instrument, unamortized discount $ 5.2 $ 5.2 $ 5.3 $ 0.0
Debt instrument, redemption price (percent)   100.00%    
Senior Indebtedness | 5.050% 2029 Notes | US Treasury (UST) Interest Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 15.00%