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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Total unamortized discount | $ (10.4) | $ (124.6)
Total debt issuance costs | (16.3) | (25.2)
Senior Indebtedness | 4.333% 2023 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (0.2) | (1.3)
Total debt issuance costs | (0.4) | (2.9)
Senior Indebtedness | 2.670% 2023 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (0.4) | (1.3)
Total debt issuance costs | (0.2) | (0.8)
Senior Indebtedness | 0.972% 2024 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (1.2) | (2.5)
Total debt issuance costs | (0.6) | (1.3)
Senior Indebtedness | 0.983% 2024 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (1.3) | (2.2)
Total debt issuance costs | (0.8) | (1.4)
Senior Indebtedness | 4.250% 2025 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (7.3) | (10.2)
Total debt issuance costs | (0.9) | (1.3)
Senior Convertible Debt | 2015 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | 0.0 | (3.7)
Total debt issuance costs | 0.0 | (0.1)
Senior Convertible Debt | 2017 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | 0.0 | (23.4)
Total debt issuance costs | (0.4) | (0.6)
Senior Convertible Debt | 2020 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | 0.0 | (75.3)
Total debt issuance costs | (4.4) | (6.2)
Junior Convertible Debt | 2017 Junior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | $ 0.0 | $ (4.7)

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