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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 07, 2024 | Mar. 31, 2023
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total unamortized discount | $ (13.9) |  | $ (10.4)
Total debt issuance costs | (5.5) |  | (16.3)
Senior Indebtedness | 4.333% 2023 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | 0.0 |  | (0.2)
Total debt issuance costs | 0.0 |  | (0.4)
Senior Indebtedness | 2.670% 2023 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | 0.0 |  | (0.4)
Total debt issuance costs | 0.0 |  | (0.2)
Senior Indebtedness | 0.972% 2024 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | 0.0 |  | (1.2)
Total debt issuance costs | 0.0 |  | (0.6)
Senior Indebtedness | 0.983% 2024 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (0.4) |  | (1.3)
Total debt issuance costs | (0.2) |  | (0.8)
Senior Indebtedness | 4.250% 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (4.4) |  | (7.3)
Total debt issuance costs | (0.6) |  | (0.9)
Senior Indebtedness | 5.050% 2029 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (5.2) | $ (5.3) | 0.0
Total debt issuance costs | (2.2) |  | 0.0
Senior Convertible Debt | 2017 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt issuance costs | (0.1) |  | (0.4)
Senior Convertible Debt | 2020 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt issuance costs | (1.7) |  | (4.4)
Commercial Paper |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (3.9) |  | 0.0
Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total debt issuance costs | (0.7) |  | 0.0
Revolving Credit Facility | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Total debt issuance costs | $ 0.0 |  | $ (8.6)

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