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Current Assets and Current Liabilities - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid taxes $ 80.0 $ 78.5
Prepaid rent 22.8 22.7
Leasehold incentive receivable 11.1 9.4
Prepaid insurance 5.8 1.5
Unrealized gains on forward foreign exchange contracts 3.8 0.0
Prepaid duties 7.0 7.0
Other 34.3 28.7
Prepaid expenses and other current assets $ 164.8 $ 147.8