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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Sep. 30, 2024 | May 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total unamortized discount | $ (12.7) |  | $ (13.9)
Total debt issuance costs | (18.6) |  | (5.5)
Commercial Paper |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (5.0) |  | (3.9)
Senior Indebtedness | 0.983% 2024 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | 0.0 |  | (0.4)
Total debt issuance costs | 0.0 |  | (0.2)
Senior Indebtedness | 4.250% 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (2.9) |  | (4.4)
Total debt issuance costs | (0.4) |  | (0.6)
Senior Indebtedness | 5.050% 2029 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (4.8) |  | (5.2)
Total debt issuance costs | (2.0) |  | (2.2)
Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total debt issuance costs | (0.4) |  | (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 | (0.3) |  | (1.7)
Senior Subordinated Convertible Debt | 2024 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt issuance costs | $ (15.4) | $ (16.5) | $ 0.0

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