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Debt (Schedule of Interest Expense) (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debt Disclosure [Abstract]
Cash interest		$ 152.0	$ 122.9	$ 86.8
Amortization of debt discount and financing costs		11.6	14.3	12.9
Interest expense, before interest on dissenting shareholders' liability	[1]	163.6	137.2	99.7
Interest on dissenting shareholders' liability		35.3	56.5	15.5
Total interest expense		$ 198.9	$ 193.7	$ 115.2
[1] Represents interest expense before interest on dissenting shareholders' liability.

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Business Combination, Liabilities Accrued, Interest Expense

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The component of interest expense representing the cash portion of interest expense charged against earnings in the period.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense, excluding interest on the dissenters' liability.

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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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

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Amount of the cost of borrowed funds accounted for as interest expense.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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