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Debt (Schedule of Interest Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Debt Disclosure [Abstract]
Cash interest	$ 122.9	$ 86.8	$ 45.7
Amortization of debt discount and financing costs	14.3	12.9	9.2
Interest expense, before interest on dissenters' liability	137.2	99.7	54.9
Interest on dissenting shareholders' liability	56.5	15.5	0.0
Total interest expense	$ 193.7	$ 115.2	$ 54.9

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Business Combination, Liabilities Accrued, Interest Expense

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- Definition

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/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

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- Definition

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

+ References

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

Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.9)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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