Intangible Assets and Goodwill - Carrying Values of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 712.9	$ 734.8
Accumulated Amortization	(114.0)	(113.2)
Net	598.9	621.6
Indefinite-lived intangible assets	579.2	614.1
Total intangible assets, excluding goodwill	1,178.1	1,235.7
Reacquired rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	400.4	400.4
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23.0	23.0
Lease rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	71.2	80.1
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 218.3	$ 231.3

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Topic 350
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-Section 50
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- Definition

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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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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