Accounting Policies - Other (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shipping and Handling
Shipping and handling costs included in selling, general and administrative expense	$ 52.1	$ 47.9	$ 53.5
Research and Development
Research and development costs included in selling, general, and administrative expense	$ 29.0	$ 26.5	$ 23.5