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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Mar. 31, 2020 | May 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total unamortized discount | $ (815.0) | $ (1,043.2) |
Total debt issuance costs | (58.1) | (67.9) |
Bridge Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | 0.0 | (3.1) |
Total debt issuance costs | 0.0 | (3.1) |
Senior Indebtedness |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount |  |  | $ (10.5)
Total debt issuance costs |  |  | $ (24.4)
Senior Indebtedness | 4.333% 2023 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (3.2) | (3.5) |
Total debt issuance costs | (7.1) | (7.7) |
Senior Indebtedness | 3.922% 2021 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (1.7) | (2.1) |
Total debt issuance costs | (3.7) | (4.8) |
Senior Indebtedness | 2.670% 2023 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (2.9) | 0.0 |
Total debt issuance costs | (1.7) | 0.0 |
Senior Indebtedness | 4.250% 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (14.8) | 0.0 |
Total debt issuance costs | (2.0) | 0.0 |
Senior Convertible Debt | 2017 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (337.0) | (504.2) |
Total debt issuance costs | (8.7) | (13.0) |
Senior Convertible Debt | 2015 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (120.6) | (192.9) |
Total debt issuance costs | (4.4) | (7.0) |
Junior Convertible Debt | 2017 Junior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total unamortized discount | (334.8) | (337.4) |
Total debt issuance costs | $ (3.1) | $ (3.1) |

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