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Debt and Credit Facility - Components (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 31, 2019 | May 31, 2018
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Debt Instrument [Line Items] |  |  |
Amount of unamortized debt discount of debentures | $ (1,238.9) | $ (1,268.7) | $ (10.5)
Debt issuance cost | (77.6) | (83.6) | $ (24.4)
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuance cost | (13.6) | (14.7) |
Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuance cost | (16.8) | (19.4) |
2023 Senior Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amount of unamortized debt discount of debentures | (4.2) | (4.4) |
Debt issuance cost | (9.6) | (10.2) |
2021 Senior Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amount of unamortized debt discount of debentures | (3.4) | (3.8) |
Debt issuance cost | (7.8) | (8.8) |
2017 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Amount of unamortized debt discount of debentures | (547.8) | (561.9) |
Debt issuance cost | (14.2) | (14.5) |
2015 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Amount of unamortized debt discount of debentures | (338.7) | (351.4) |
Debt issuance cost | (12.4) | (12.8) |
2017 Junior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Amount of unamortized debt discount of debentures | (344.8) | (347.2) |
Debt issuance cost | $ (3.2) | $ (3.2) |

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