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Intangible Assets and Goodwill - Carrying Values of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Mar. 31, 2018
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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

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