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Debt and Credit Facility (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2017 | Jun. 30, 2017 | Feb. 28, 2017 | Feb. 28, 2015 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance amortization |  |  | $ 33.7 |  |  |  | $ 46.8 | $ 40.1 | $ 46.8 |  |
Debt portion of convertible debt issuance costs |  |  | 3.4 |  |  |  |  |  |  |  |
Equity portion of convertible debt issuance costs |  |  | 12.5 |  |  |  |  |  |  |  |
Induced conversion of convertible debt expense |  |  | 5.0 |  |  |  |  |  |  |  |
Shares issued to settle 2007 junior debt, value |  |  |  |  |  |  |  | 298.5 | 862.7 |  |
Loss on settlement of convertible debt |  |  |  |  | $ 2.2 | $ 13.8 | 43.9 | 16.0 | 43.9 | $ 0.0 | $ 50.6
Amount of unamortized debt discount of debentures |  |  |  |  |  |  | 1,516.5 | 1,372.9 | 1,516.5 |  |
2015 Senior Subordinated Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  |  | $ 1,694.7 |  |  |  |  |  |  |
Debt issuance amortization |  |  |  | 30.3 |  |  | 16.6 | 14.8 | 16.6 |  |
Debt portion of convertible debt issuance costs |  |  |  | 20.4 |  |  |  |  |  |  |
Equity portion of convertible debt issuance costs |  |  |  | 9.9 |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  |  |  | 446.6 | 400.3 | 446.6 |  |
2007 Junior Subordinated Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  |  |  | 143.8 |  |  |
Extinguishment of debt, principal amount |  |  |  |  |  |  |  | $ 32.5 |  |  |
Shares converted |  |  |  |  |  |  |  | 500,000 |  |  |
Debt issuance amortization |  |  |  |  |  |  | 0.7 | $ 0.0 | 0.7 |  |
Shares issued to settle convertible debt |  |  |  |  |  |  |  | 3,700,000 |  |  |
Loss on settlement of convertible debt |  | $ 13.8 |  |  |  |  |  | $ 2.2 |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  |  |  | 93.1 | 0.0 | 93.1 |  |
2017 Junior Subordinated Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  | 567.7 |  |  |  |  |  |  |  |
Debt issuance amortization |  |  |  |  |  |  | 3.4 | 3.3 | 3.4 |  |
Amount of unamortized debt discount of debentures |  |  |  |  |  |  | 309.3 | 356.3 | 309.3 |  |
2017 Senior Subordinated Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  | 2,043.6 |  |  |  |  |  |  |  |
Debt issuance amortization |  |  |  |  |  |  | 17.6 | 16.1 | 17.6 |  |
Debt portion of convertible debt issuance costs |  |  | 17.8 |  |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  |  |  | $ 667.5 | 616.3 | $ 667.5 |  |
Long-term Debt | 2007 Junior Subordinated Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount | $ 14.6 | $ 111.3 | $ 431.3 | 575.0 |  |  |  | $ 111.3 |  |  |
Shares issued to settle convertible debt |  | 3,200,000 | 11,997,924 |  |  |  |  | 3,200,000 |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  |  |  |  |  |  | $ 41.0 |  |  |
Shares issued to settle 2007 junior debt, value |  | $ 254.6 | $ 862.7 |  |  |  |  |  |  |  |
Extinguishment of debt |  | 374.0 | 1,293.9 | 1,134.6 |  |  |  |  |  |  |
Extinguishment of debt, liability component |  | 56.3 | 188.0 | 238.3 |  |  |  |  |  |  |
Extinguishment of debt, equity component |  | 321.1 | $ 1,105.9 | $ 896.3 |  |  |  |  |  |  |
Long-term Debt | 2017 Junior Subordinated Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  | 111.3 |  |  |  |  |  |  |  |  |
Shares issued to settle 2007 junior debt, value |  | $ 119.3 |  |  |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  |  |  |  | $ 55.1 |  |  |

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