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Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 01, 2020 | Mar. 31, 2020 | May 31, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | $ (399.6) |  | $ (1,043.2) |
Total debt issuance costs | (38.0) |  | (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 | 3.922% 2021 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (0.8) |  | (2.1) |
Total debt issuance costs | (1.7) |  | (4.8) |
Senior Indebtedness | 4.333% 2023 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (2.7) |  | (3.5) |
Total debt issuance costs | (5.9) |  | (7.7) |
Senior Indebtedness | 2.670% 2023 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (2.5) |  | 0.0 |
Total debt issuance costs | (1.4) |  | 0.0 |
Senior Indebtedness | 0.972% 2024 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (4.1) | $ (4.2) | 0.0 |
Total debt issuance costs | (2.2) |  | 0.0 |
Senior Indebtedness | 4.250% 2025 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (13.5) |  | 0.0 |
Total debt issuance costs | (1.8) |  | 0.0 |
Senior Indebtedness | 2020 Senior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (110.0) |  |  |
Senior Convertible Debt | 2015 Senior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (33.3) |  | (192.9) |
Total debt issuance costs | (1.2) |  | (7.0) |
Senior Convertible Debt | 2017 Senior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (100.9) |  | (504.2) |
Total debt issuance costs | (2.6) |  | (13.0) |
Senior Convertible Debt | 2020 Senior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (108.0) |  | 0.0 |
Total debt issuance costs | (8.9) |  | 0.0 |
Junior Convertible Debt | 2017 Junior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total unamortized discount | (133.8) |  | (337.4) |
Total debt issuance costs | $ (1.2) |  | $ (3.1) |

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