Restructuring and Other Related Charges Restructuring and Related Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 19.0	$ 22.1	$ 24.3
Impairment charges	2.3	4.8	12.0
Employee severance related
Restructuring Cost and Reserve [Line Items]
Restructuring charges	14.2	14.7	11.8
Facility exit and other related
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2.5	$ 2.6	$ 0.5