Restructuring (Restructuring Charges by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring (gains) charges, net	$ (0.2)	$ 23.2	$ (13.3)	$ 22.0
Process Flow Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring (gains) charges, net	0.0	4.7	(12.6)	4.7
Payment & Merchandising Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring (gains) charges, net	(0.2)	13.8	(0.7)	12.6
Aerospace & Electronics
Restructuring Cost and Reserve [Line Items]
Restructuring (gains) charges, net	0.0	4.7	0.0	4.7
Cost of Sales and Selling, General and Administrative
Restructuring Cost and Reserve [Line Items]
Other costs related to facility consolidations	2.4	1.3	3.8	2.6
Cost of Sales and Selling, General and Administrative | Process Flow Technologies
Restructuring Cost and Reserve [Line Items]
Other costs related to facility consolidations	$ 2.4	0.5	$ 3.8	1.9
Cost of Sales and Selling, General and Administrative | Payment & Merchandising Technologies
Restructuring Cost and Reserve [Line Items]
Other costs related to facility consolidations		$ 0.8		$ 0.7