Impairment and Restructuring Charges - Restructuring Charges by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Impairment charges									$ 0.4	$ 2.6	$ 1.3
Severance expense and related benefit costs									19.6	3.0	3.0
Exit costs									1.2	1.2	0.6
Total	$ 2.5	$ 12.0	$ 3.1	$ 3.6	$ 3.3	$ 1.6	$ 1.9	$ 0.0	21.2	6.8	4.9
Mobile
Restructuring Cost and Reserve [Line Items]
Impairment charges									0.2	1.8	0.0
Severance expense and related benefit costs									8.2	1.6	1.1
Exit costs									0.6	0.2	0.3
Total									9.0	3.6	1.4
Process
Restructuring Cost and Reserve [Line Items]
Impairment charges									0.2	0.8	1.3
Severance expense and related benefit costs									11.0	0.9	0.3
Exit costs									0.6	1.0	0.3
Total									11.8	2.7	1.9
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Impairment charges									0.0	0.0	0.0
Severance expense and related benefit costs									0.4	0.5	1.6
Exit costs									0.0	0.0	0.0
Total									$ 0.4	$ 0.5	$ 1.6