Restructuring and Other Related Charges Accrual Balance and Utilization by Type of Restructuring Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 10.7	$ 11.5
Restructuring charges	19.0	22.1	$ 24.3
Paid/Settled	(18.9)	(22.9)
Ending Balance	10.8	10.7	11.5
Employee severance and related
Restructuring Reserve [Roll Forward]
Beginning Balance	9.6	10.6
Restructuring charges	14.2	14.7	11.8
Paid/Settled	(13.8)	(15.7)
Ending Balance	10.0	9.6	10.6
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1.1	0.9
Restructuring charges	4.8	7.4
Paid/Settled	(5.1)	(7.2)
Ending Balance	$ 0.8	$ 1.1	$ 0.9