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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($)
$ in Millions
Jun. 30, 2024
May 31, 2024
Mar. 31, 2024
Debt Instrument [Line Items]      
Total unamortized discount $ (9.9)   $ (13.9)
Total debt issuance costs (20.4)   (5.5)
Commercial Paper      
Debt Instrument [Line Items]      
Total unamortized discount (1.1)   (3.9)
Senior Indebtedness | 0.983% 2024 Notes      
Debt Instrument [Line Items]      
Total unamortized discount (0.2)   (0.4)
Total debt issuance costs (0.1)   (0.2)
Senior Indebtedness | 4.250% 2025 Notes      
Debt Instrument [Line Items]      
Total unamortized discount (3.6)   (4.4)
Total debt issuance costs (0.5)   (0.6)
Senior Indebtedness | 5.050% 2029 Notes      
Debt Instrument [Line Items]      
Total unamortized discount (5.0)   (5.2)
Total debt issuance costs (2.1)   (2.2)
Term Loan Facility      
Debt Instrument [Line Items]      
Total debt issuance costs (0.5)   (0.7)
Senior Subordinated Convertible Debt | 2017 Senior Convertible Debt      
Debt Instrument [Line Items]      
Total debt issuance costs (0.1)   (0.1)
Senior Subordinated Convertible Debt | 2020 Senior Convertible Debt      
Debt Instrument [Line Items]      
Total debt issuance costs (1.0)   (1.7)
Senior Subordinated Convertible Debt | 2024 Senior Convertible Debt      
Debt Instrument [Line Items]      
Total debt issuance costs $ (16.1) $ (16.5) $ 0.0