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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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Amount, after accumulated amortization, of debt discount.

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