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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Total unamortized discount | $ (263.4) | $ (273.0)
Total debt issuance costs | (30.6) | (32.3)
Senior Indebtedness | 3.922% 2021 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | 0.0 | (0.3)
Total debt issuance costs | 0.0 | (0.7)
Senior Indebtedness | 4.333% 2023 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (2.2) | (2.4)
Total debt issuance costs | (4.7) | (5.3)
Senior Indebtedness | 2.670% 2023 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (2.0) | (2.3)
Total debt issuance costs | (1.2) | (1.3)
Senior Indebtedness | 0.972% 2024 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (3.5) | (3.8)
Total debt issuance costs | (1.8) | (2.0)
Senior Indebtedness | 0.983% 2024 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (2.9) | 0.0
Total debt issuance costs | (1.8) | 0.0
Senior Indebtedness | 4.250% 2025 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (12.2) | (12.8)
Total debt issuance costs | (1.6) | (1.7)
Senior Convertible Debt | 2015 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (18.9) | (20.1)
Total debt issuance costs | (0.7) | (0.7)
Senior Convertible Debt | 2017 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (68.7) | (71.3)
Total debt issuance costs | (1.7) | (1.8)
Senior Convertible Debt | 2020 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (95.1) | (101.6)
Total debt issuance costs | (7.8) | (8.3)
Junior Convertible Debt | 2017 Junior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (57.9) | (58.4)
Total debt issuance costs | $ (0.5) | $ (0.5)

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