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Debt (Interest Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Debt Disclosure [Abstract]
Cash interest	$ 32.5	$ 34.6
Amortization of debt discount and financing costs	2.9	4.4
Interest expense, before interest on dissenting shareholders' liability	35.4	39.0
Interest on dissenting shareholders' liability	15.9	13.3
Total interest expense	$ 51.3	$ 52.3

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- Definition

Business Combination, Liabilities Accrued, Interest Expense

+ References

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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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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