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Revenue (Summary of Contract Assets and Liabilities) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Change in Contract with Customer, Asset [Abstract]  
Balance beginning of period $ 10.1
Contract with Customer, Asset, Increase for Expected Returns of Replacement Parts Sold During the Period 21.0
Contract with Customer, Asset, Transfer of Returned Replacement Parts to Inventory 18.8
Contract with Customer, Asset, Increase (Decrease) for Foreign Currency Translation (0.1)
Balance end of period 12.2
Change in Contract with Customer, Liability [Abstract]  
Balance beginning of period 104.4
Contract with Customer, Liability, Increase From Advance Consideration Received 124.9
Contract with Customer, Liability, Increase from Accrual for Expected Reimbursement of Replacement Parts 52.3
Contract with Customer, Liability, Revenue Recognized (29.0)
Contract with Customer, Liability, Advance Consideration Received Applied to Accounts Receivable, Net (100.9)
Contract with Customer, Liability, Replacement Part Settlements 45.7
Contract with Customer, Liability, Foreign Currency Translation (1.0)
Balance end of period $ 105.0