Cost-Reduction Actions - Statement of Income Classifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	$ 0.8	$ 13.2	$ 14.4	$ 48.6
Cost of revenue - services
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	(0.2)	2.9	0.9	15.7
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	(0.1)	10.8	8.7	14.8
Research and development
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	(0.2)	0.1	1.9	0.3
Other expense, net
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	$ 1.3	$ (0.6)	$ 2.9	$ 17.8