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Debt and Credit Facility - Debt and Credit Facility (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Nov. 30, 2017 | Jun. 30, 2017 | Feb. 28, 2017 | Feb. 28, 2015 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2015 | May 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on settlement of debt |  |  |  |  | $ 8.3 | $ 0.2 | $ 4.1 | $ 2.1 | $ 13.8 | $ 12.6 | $ 16.0 | $ 43.9 | $ 50.6 |
Shares issued to settle 2007 junior debt, value |  |  |  |  |  |  |  |  |  |  | 298.5 | 862.7 |  |
Amount of unamortized debt discount of debentures |  |  |  |  | 1,268.7 |  |  |  |  | 1,268.7 | 1,372.9 |  |  | $ 10.5
Debt issuance amortization |  |  | $ 33.7 |  | 83.6 |  |  |  |  | 83.6 | 40.1 |  |  | $ 24.4
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 |  |  |  |  |  |  |  |  |  |  |
2015 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  |  | $ 1,690.0 |  |  |  |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  | 351.4 |  |  |  |  | 351.4 | 400.3 |  |  |
Debt issuance amortization |  |  |  | 30.3 | 12.8 |  |  |  |  | 12.8 | 14.8 |  |  |
Debt portion of convertible debt issuance costs |  |  |  | 20.4 |  |  |  |  |  |  |  |  |  |
Equity portion of convertible debt issuance costs |  |  |  | 9.9 |  |  |  |  |  |  |  |  |  |
2007 Junior Subordinated Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  |  |  |  |  |  | 143.8 | $ 431.3 |  |
Extinguishment of debt, principal amount |  |  |  |  |  |  |  |  |  |  | 32.5 |  |  |
Shares converted (in shares) | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on settlement of debt |  | $ 13.8 |  |  |  |  |  |  |  |  | $ 2.2 |  |  |
Shares issued to settle convertible debt (in shares) |  |  |  |  |  |  |  |  |  |  | 3.7 | 12.0 |  |
2017 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  | 567.7 |  |  |  |  |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  | 347.2 |  |  |  |  | 347.2 | $ 356.3 |  |  |
Debt issuance amortization |  |  |  |  | 3.2 |  |  |  |  | 3.2 | 3.3 |  |  |
2017 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  | 2,040.0 |  |  |  |  |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  | 561.9 |  |  |  |  | 561.9 | 616.3 |  |  |
Debt issuance amortization |  |  |  |  | 14.5 |  |  |  |  | 14.5 | 16.1 |  |  |
Debt portion of convertible debt issuance costs |  |  | 17.8 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Redemption costs | $ 41.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to settle 2007 junior debt, value |  | $ 254.6 | $ 862.7 |  |  |  |  |  |  |  |  |  |  |
Shares issued to settle convertible debt (in shares) |  | 3.2 | 12.0 |  |  |  |  |  |  |  | 3.2 |  |  |
Extinguishment of debt, liability component |  | $ 56.3 | $ 188.0 | 238.3 |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  | 374.0 | 1,290.0 | 1,130.0 |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, equity component |  | 321.1 | $ 1,110.0 | $ 896.3 |  |  |  |  |  |  |  |  |  |
Long-term Debt | 2017 Junior 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 |  |  |  |  | $ 55.1 |  |  |  |

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