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Debt and Credit Facility - Components (Details) - USD ($) $ in Millions | Mar. 31, 2019 | May 31, 2018 | Mar. 31, 2018 | Feb. 28, 2017 | Feb. 28, 2015
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Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | $ (1,268.7) | $ (10.5) | $ (1,372.9) |  |
Debt issuance cost | (83.6) | $ (24.4) | (40.1) | $ (33.7) |
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance cost | (14.7) |  | (5.9) |  |
Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance cost | (19.4) |  |  |  |
2023 Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (4.4) |  |  |  |
Debt issuance cost | (10.2) |  |  |  |
2021 Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (3.8) |  |  |  |
Debt issuance cost | (8.8) |  |  |  |
2017 Senior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (561.9) |  | (616.3) |  |
Debt issuance cost | (14.5) |  | (16.1) |  |
2015 Senior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (351.4) |  | (400.3) |  |
Debt issuance cost | (12.8) |  | (14.8) |  | $ (30.3)
2017 Junior Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of unamortized debt discount of debentures | (347.2) |  | (356.3) |  |
Debt issuance cost | $ (3.2) |  | $ (3.3) |  |

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