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Debt (Schedule of Debt Issuance and Repayment Costs) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Mar. 31, 2017
Debt Instrument, Redemption [Line Items] |  |
Previously incurred unamortized discount and debt issuance costs of Term Loan B | $ 0.4 | $ 0.5
Term Loan | Term Loan B Facility |  |
Debt Instrument, Redemption [Line Items] |  |
Previously incurred unamortized discount and debt issuance costs of Term Loan B | 23.8 |
Term Loan | Term Loan B-1 Facility |  |
Debt Instrument, Redemption [Line Items] |  |
New costs incurred to issue the Term Loan B-1 | 1.6 |
Term Loan | Term Loan B and Term Loan B-1 |  |
Debt Instrument, Redemption [Line Items] |  |
Total debt issuance and repayment costs | 25.4 |
Amortize Over Life of Term Loan B-1 | Term Loan | Term Loan B Facility |  |
Debt Instrument, Redemption [Line Items] |  |
Previously incurred unamortized discount and debt issuance costs of Term Loan B | 20.9 |
Amortize Over Life of Term Loan B-1 | Term Loan | Term Loan B-1 Facility |  |
Debt Instrument, Redemption [Line Items] |  |
New costs incurred to issue the Term Loan B-1 | 0.1 |
Amortize Over Life of Term Loan B-1 | Term Loan | Term Loan B and Term Loan B-1 |  |
Debt Instrument, Redemption [Line Items] |  |
Total debt issuance and repayment costs | 21.0 |
Loss on Extinguishment of Debt | Term Loan | Term Loan B Facility |  |
Debt Instrument, Redemption [Line Items] |  |
Previously incurred unamortized discount and debt issuance costs of Term Loan B | 2.9 |
Loss on Extinguishment of Debt | Term Loan | Term Loan B-1 Facility |  |
Debt Instrument, Redemption [Line Items] |  |
New costs incurred to issue the Term Loan B-1 | 1.5 |
Loss on Extinguishment of Debt | Term Loan | Term Loan B and Term Loan B-1 |  |
Debt Instrument, Redemption [Line Items] |  |
Total debt issuance and repayment costs | $ 4.4 |

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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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