Restructuring, Impairment and Other Charges - Schedule of Restructuring, Impairment and Other Charges Recognized in Results of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]
Employee Terminations	$ 2.4	$ 0.8	$ 8.2	$ 3.3
Other Restructuring Costs				0.7
Total Restructuring Charges	2.4	0.8	8.2	4.0
Other Charges			0.1	0.1
Impairment	0.4		0.4
Total	2.8	0.8	8.7	4.1
U.S.
Restructuring Cost And Reserve [Line Items]
Employee Terminations	1.6	0.6	4.8	1.1
Other Restructuring Costs				0.7
Total Restructuring Charges	1.6	0.6	4.8	1.8
Other Charges			0.1	0.1
Impairment	0.0		0.0
Total	1.6	0.6	4.9	1.9
International
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.0	0.1	1.0	1.9
Other Restructuring Costs				0.0
Total Restructuring Charges	0.0	0.1	1.0	1.9
Other Charges			0.0	0.0
Impairment	0.0		0.0
Total	0.0	0.1	1.0	1.9
Corporate
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.8	0.1	2.4	0.3
Other Restructuring Costs				0.0
Total Restructuring Charges	0.8	0.1	2.4	0.3
Other Charges			0.0	0.0
Impairment	0.4		0.4
Total	$ 1.2	$ 0.1	$ 2.8	$ 0.3