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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 | 6 Months Ended | 12 Months Ended |
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Nov. 30, 2017 | Jun. 30, 2017 | Feb. 28, 2017 | Feb. 28, 2015 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2015 | May 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on settlement of convertible debt |  |  |  |  | $ 4.1 | $ 0.0 | $ 4.1 | $ 13.8 |  | $ 43.9 | $ 50.6 |
Amount of unamortized debt discount of debentures |  |  |  |  | 1,327.0 |  | 1,327.0 |  | $ 1,372.9 |  |  | $ 10.5
Debt issuance costs |  |  | $ 33.7 |  | 101.2 |  | $ 101.2 |  | 40.1 |  |  | $ 24.4
Equity portion of convertible debt issuance costs |  |  | 12.5 |  |  |  |  |  |  |  |  |
Induced conversion of convertible debt expense |  |  | 5.0 |  |  |  |  |  |  |  |  |
2017 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) |  |  |  |  |  |  | 8 years 4 months 16 days |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  | 2,040.0 |  |  |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  | 589.4 |  | $ 589.4 |  | 616.3 |  |  |
Debt issuance costs |  |  |  |  | 15.4 |  | $ 15.4 |  | 16.1 |  |  |
Debt portion of convertible debt issuance costs |  |  | 17.8 |  |  |  |  |  |  |  |  |
2015 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) |  |  |  |  |  |  | 6 years 4 months 16 days |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  |  | $ 1,690.0 |  |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  | 376.2 |  | $ 376.2 |  | 400.3 |  |  |
Debt issuance costs |  |  |  |  | 13.8 |  | $ 13.8 |  | 14.8 |  |  |
Equity portion of convertible debt issuance costs |  |  |  | 9.9 |  |  |  |  |  |  |  |
2017 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) |  |  |  |  |  |  | 18 years 4 months 16 days |  |  |  |  |
Proceeds from issuance of senior subordinated convertible debentures, net of issuance costs |  |  | 567.7 |  |  |  |  | 111.3 |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  | 351.8 |  | $ 351.8 |  | 356.3 |  |  |
Debt issuance costs |  |  |  | 30.3 | 3.3 |  | 3.3 |  | 3.3 |  |  |
Debt portion of convertible debt issuance costs |  |  | 3.4 | 20.4 |  |  |  |  |  |  |  |
2007 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on settlement of convertible debt |  | $ 13.8 |  |  |  |  |  |  | 2.2 |  |  |
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 |  |  |  |  |  |  |  |  |  |
Stock issued during period, value, conversion of convertible securities |  | 119.3 |  |  |  |  |  |  |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  |  | $ 55.1 |  | $ 55.1 |  |  |  |  |
Long-term Debt | 2007 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt | $ 14.6 | $ 111.3 | $ 431.3 | 575.0 |  |  |  | $ 111.3 | $ 32.5 |  |  |
Stock issued during period, shares, conversion of convertible securities | 0.5 | 3.2 | 12.0 |  |  |  |  | 3.2 |  |  |  |
Payment for debt extinguishment or debt prepayment cost | $ 41.0 |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, value, conversion of convertible securities |  | $ 254.6 | $ 862.7 |  |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt |  | 374.0 | 1,293.9 | 1,134.6 |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt, liability component |  | 56.3 | 188.0 | 238.3 |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt, equity component |  | $ 321.1 | $ 1,105.9 | $ 896.3 |  |  |  |  |  |  |  |

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