Intangible Assets and Goodwill - Carrying Values of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2017	Apr. 01, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 508.5	$ 502.6
Accumulated Amortization	(102.8)	(84.5)
Net	405.7	418.1
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	80.1	74.2
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5.0	$ 5.0

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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

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

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