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Components (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017 | Feb. 28, 2017 | Feb. 28, 2015
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Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | $ (1,372.9) | $ (1,516.5) |  |
Debt issuance cost | (40.1) | (46.8) | $ (33.7) |
December 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance cost | (5.9) | (8.5) |  |
2017 Senior Subordinated Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | (616.3) | (667.5) |  |
Debt issuance cost | (16.1) | (17.6) |  |
2015 Senior Subordinated Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | (400.3) | (446.6) |  |
Debt issuance cost | (14.8) | (16.6) |  | $ (30.3)
2017 Junior Subordinated Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | (356.3) | (309.3) |  |
Debt issuance cost | (3.3) | (3.4) |  |
2007 Junior Subordinated Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | 0.0 | (93.1) |  |
Debt issuance cost | $ 0.0 | $ (0.7) |  |

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