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Revenue (Contract Liability) (Details)
$ in Millions
3 Months Ended
Sep. 30, 2018
USD ($)
Change In Contract With Customer, Liability [Roll Forward]  
Contract liability, July 1, 2018 $ 607.5
Recognition of revenue included in beginning of year contract liability (47.4)
Contract liability, net of revenue recognized on contracts during the period 30.8
Currency adjustments (5.8)
Contract liability, September 30, 2018 $ 585.1