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Debt (Loss on Extinguishment of Debt and Debt Issuance Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ 1.9	$ 35.7	$ 40.4
New Debt Issuance Costs
Debt Instrument [Line Items]
Loss on extinguishment of debt		11.0	20.6
Capitalized & Amortized Over Life of New Issuances		11.6	115.0
Total		22.6	135.6
Previously Incurred Debt Issuance Costs Or Unamortized Discount
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 24.7	$ 19.8
Term Loan B Facility
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ 1.9

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- Definition

Debt Instrument, Debt Issuance and Redemption Costs, Total

+ References

No definition available.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
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