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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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Debt Instrument, Debt Issuance and Redemption Costs, Total

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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

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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

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