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Debt (Interest Expense) (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Debt Disclosure [Abstract] |  |
Cash interest | $ 32.5 | $ 34.6
Amortization of debt discount and financing costs | 2.9 | 4.4
Interest expense, before interest on dissenting shareholders' liability | 35.4 | 39.0
Interest on dissenting shareholders' liability | 15.9 | 13.3
Total interest expense | $ 51.3 | $ 52.3

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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