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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 11, 2024 | May 31, 2024 | Mar. 31, 2024
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | $ (17.6) |  |  | $ (13.9)
Total debt issuance costs | (20.6) |  |  | (5.5)
Commercial Paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (3.2) |  |  | (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 | (2.1) |  |  | (4.4)
Total debt issuance costs | (0.3) |  |  | (0.6)
Senior Indebtedness | 4.900% 2028 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (3.5) | $ (3.6) |  | 0.0
Total debt issuance costs | (1.8) |  |  | 0.0
Senior Indebtedness | 5.050% 2029 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (4.5) |  |  | (5.2)
Total debt issuance costs | (1.9) |  |  | (2.2)
Senior Indebtedness | 5.050% 2030 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (4.3) | $ (4.3) |  | 0.0
Total debt issuance costs | (1.8) |  |  | 0.0
Term Loan Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt issuance costs | 0.0 |  |  | (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 | 0.0 |  |  | (1.7)
Senior Subordinated Convertible Debt | 2024 Senior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt issuance costs | $ (14.7) |  | $ (16.5) | $ 0.0

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