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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Mar. 27, 2020 | Mar. 31, 2019 | May 31, 2018 | Feb. 28, 2017 | Feb. 28, 2015
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Debt Instrument [Line Items] |  |  |  |  |  |
Total unamortized discount | $ (1,043.2) |  | $ (1,268.7) |  |  |
Total debt issuance costs | (67.9) |  | (83.6) |  | $ (33.7) |
2015 Senior Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt issuance costs |  |  |  |  |  | $ (30.3)
Bridge Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total unamortized discount | (3.1) |  | 0.0 |  |  |
Total debt issuance costs | (3.1) | $ (6.2) | 0.0 |  |  |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total unamortized discount |  |  |  | $ (10.5) |  |
Total debt issuance costs |  |  |  | $ (24.4) |  |
Senior Notes | 2023 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total unamortized discount | (3.5) |  | (4.4) |  |  |
Total debt issuance costs | (7.7) |  | (10.2) |  |  |
Senior Notes | 2021 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total unamortized discount | (2.1) |  | (3.8) |  |  |
Total debt issuance costs | (4.8) |  | (8.8) |  |  |
Senior Convertible Debt | 2017 Senior Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total unamortized discount | (504.2) |  | (561.9) |  |  |
Total debt issuance costs | (13.0) |  | (14.5) |  |  |
Senior Convertible Debt | 2015 Senior Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total unamortized discount | (192.9) |  | (351.4) |  |  |
Total debt issuance costs | (7.0) |  | (12.8) |  |  |
Junior Convertible Debt | 2017 Junior Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total unamortized discount | (337.4) |  | (347.2) |  |  |
Total debt issuance costs | $ (3.1) |  | $ (3.2) |  |  |

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