Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) estimate	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Property, Plant and Equipment
Property, plant and equipment — net	$ 294.9	$ 308.8
Number of estimates upon which the product liability reserves are based | estimate	2
Research and development costs	$ 37.9	44.5	$ 57.6
Assets Leased to Others
Property, Plant and Equipment
Property, plant and equipment — net	$ 54.3	$ 57.9