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Intangible Assets and Goodwill - Carrying Values of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Apr. 01, 2017
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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

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References 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 + Details
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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/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 + Details
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