Restructuring and Other (Income) Charges, net - Restructuring (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Charges
Gain on sale of assets and businesses	$ 0.0	$ 0.0	$ (11.5)
Severance and other employee-related costs	1.3	6.3	0.0
Asset write-down	0.0	30.6	4.0
Other (income) charges, net	2.4	4.3	0.0
Total restructuring and other (income) charges, net	$ 3.7	$ 41.2	$ (7.5)