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Debt (Conversions of Convertible Senior Subordinated Notes) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 9 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Principal amount converted | $ 0 | $ 16
Convertible Senior Subordinated Notes | April 2009 Notes |  |
Debt Instrument [Line Items] |  |
Principal amount converted |  | $ 16
Common shares issued upon conversion (in shares) |  | 2
Weighted average conversion price per share (in usd per share) |  | $ 8.15
Coupon rate |  | 3.625%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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