Derivative Financial Instruments - Schedule of Fair Value of Derivative Contracts Recorded on Gross Basis in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018
Derivatives, Fair Value [Line Items]
Notional Amounts	$ 487.4	$ 161.7
Forward foreign currency exchange contracts	8.6	0.0
Forward foreign currency exchange contracts - liabilities	0.1	7.7
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Amounts	466.1	161.7
Forward foreign currency exchange contracts	8.3	0.0
Forward foreign currency exchange contracts - liabilities	0.1	7.7
Designated as Hedging Instrument \| Forward foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amounts	132.1	161.7
Forward foreign currency exchange contracts	3.5	0.0
Forward foreign currency exchange contracts - liabilities	0.1	7.7
Designated as Hedging Instrument \| Net investment hedges
Derivatives, Fair Value [Line Items]
Notional Amounts	334.0	0.0
Forward foreign currency exchange contracts	4.8	0.0
Forward foreign currency exchange contracts - liabilities	0.0	0.0
Not Designated as Hedging Instrument \| Forward foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amounts	21.3	0.0
Forward foreign currency exchange contracts	0.3	0.0
Forward foreign currency exchange contracts - liabilities	$ 0.0	$ 0.0

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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