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Revenue (Summary of Contract Assets and Liabilities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change in Contract with Customer, Liability [Abstract]    
Balance beginning of period $ 104.0 $ 76.8
Contract with Customer, Liability, Increase From Advance Consideration Received 192.7 147.7
Contract with Customer, Liability, Revenue Recognized (46.6) (33.8)
Contract with Customer, Liability, Advance Consideration Received Applied to Accounts Receivable, Net (85.6) (87.4)
Contract with Customer, Liability, Foreign Currency Translation 7.5 0.7
Balance end of period $ 172.0 $ 104.0