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Debt (Narrative - Convertible Senior Subordinated Notes) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015 | Apr. 30, 2013
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt | $ 40.4 | $ 0.0 | $ 11.7 |
Convertible Senior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt | $ 40.4 |  | 11.7 |
Convertible Senior Subordinated Notes | January 2012 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Coupon rate | 4.00% |  |  |
Convertible Senior Subordinated Notes | April 2013 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Coupon rate | 1.25% |  |  |
Principal amount of notes |  |  |  | $ 60.0
Conversions of Convertible Senior Subordinated Notes [Member] | Convertible Senior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt | $ 0.0 | $ 0.0 | $ 1.3 |

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