Restructuring (Restructuring Charges by Segment) (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]
Restructuring (gains) charges, net	$ (1.1)	$ 0.0	$ (14.3)	$ 22.0
Aerospace & Electronics
Restructuring Cost and Reserve [Line Items]
Restructuring (gains) charges, net	0.0	0.0	0.0	4.7
Process Flow Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring (gains) charges, net	0.0	0.0	(12.6)	4.7
Payment & Merchandising Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring (gains) charges, net	(1.1)	0.0	(1.7)	12.6
Cost of Sales and Selling, General and Administrative
Restructuring Cost and Reserve [Line Items]
Other costs related to facility consolidations	1.9	1.4	5.7	4.0
Cost of Sales and Selling, General and Administrative | Process Flow Technologies
Restructuring Cost and Reserve [Line Items]
Other costs related to facility consolidations	$ 1.9	1.2	$ 5.7	3.0
Cost of Sales and Selling, General and Administrative | Payment & Merchandising Technologies
Restructuring Cost and Reserve [Line Items]
Other costs related to facility consolidations		$ 0.2		$ 1.0