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Debt (Schedule of Convertible Senior Subordinated Notes) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt outstanding |  | $ 3,107.5 | $ 786.0 |
Unamortized discount & debt issuance costs |  | (0.5) | (0.4) |
Convertible Senior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount converted |  | 41.9 | 16.2 | $ 24.2
Principal amount of debt outstanding |  | 60.0 | 101.9 |
Unamortized discount & debt issuance costs |  | 0.0 | (1.9) |
Net carrying amount |  | 60.0 | 100.0 |
January 2012 Notes | Convertible Senior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount converted |  | 41.9 | 0.0 | $ 0.0
Principal amount of debt outstanding | [1] | 0.0 | 41.9 |
Unamortized discount & debt issuance costs | [1] | 0.0 | (1.9) |
Net carrying amount | [1] | $ 0.0 | 40.0 |
Coupon rate |  | 4.00% |  |
April 2013 Notes | Convertible Senior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt outstanding |  | $ 60.0 | 60.0 |
Unamortized discount & debt issuance costs |  | 0.0 | 0.0 |
Net carrying amount |  | $ 60.0 | $ 60.0 |
Coupon rate |  | 1.25% |  |
Conversion price per share (in usd per share) |  | $ 29.19 |  |
[1] | In January 2017, the outstanding principal amount of the Company's January 2012 4.00% Notes was converted into Class A voting shares and Class B non-voting shares, see table below.

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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