Commitments and Contingencies (Product Warranty Liabilties) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Accrued expenses	$ 34.8	$ 30.0
Other liabilities	75.1	71.1
Total product warranty liabilities	109.9	$ 101.1	$ 92.3
Cost of Goods Sold, Maintenance Costs	$ 5.7