Restructuring (Summary of Restructuring Charges) (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]
Severance	$ (0.3)	$ 0.0	$ (0.8)	$ 22.5
Other	0.8	0.0	13.5	0.5
Total	(1.1)	0.0	(14.3)	22.0
Aerospace & Electronics
Restructuring Cost and Reserve [Line Items]
Total	0.0	0.0	0.0	4.7
Process Flow Technologies
Restructuring Cost and Reserve [Line Items]
Total	0.0	0.0	(12.6)	4.7
Payment & Merchandising Technologies
Restructuring Cost and Reserve [Line Items]
Total	(1.1)	0.0	(1.7)	12.6
2020 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Severance	(0.3)	0.0	(0.7)	23.2
Other	0.8	0.0	0.8	(1.0)
Total	(1.1)	0.0	(1.5)	24.2
2020 Repositioning Actions | Aerospace & Electronics
Restructuring Cost and Reserve [Line Items]
Severance			0.0	4.7
Other			0.0	0.0
Total			0.0	4.7
2020 Repositioning Actions | Process Flow Technologies
Restructuring Cost and Reserve [Line Items]
Severance			0.0	4.7
Other			0.0	0.0
Total			0.0	4.7
2020 Repositioning Actions | Payment & Merchandising Technologies
Restructuring Cost and Reserve [Line Items]
Severance	(0.3)	0.0	(0.7)	13.8
Other	0.8	0.0	0.8	(1.0)
Total	$ (1.1)	$ 0.0	(1.5)	14.8
2019 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Severance			0.1	0.0
Other			0.0	0.0
Total			0.1	0.0
2019 Repositioning Actions | Process Flow Technologies
Restructuring Cost and Reserve [Line Items]
Severance			0.1	0.0
Other			0.0	0.0
Total			0.1	0.0
2017 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Severance			(0.2)	(1.0)
Other			12.7	1.5
Total			(12.9)	(2.5)
2017 Repositioning Actions | Process Flow Technologies
Restructuring Cost and Reserve [Line Items]
Severance			0.0	0.0
Other			12.7	0.0
Total			(12.7)	0.0
2017 Repositioning Actions | Payment & Merchandising Technologies
Restructuring Cost and Reserve [Line Items]
Severance			(0.2)	(1.0)
Other			0.0	1.5
Total			(0.2)	(2.5)
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Severance			0.0	0.3
Other			0.0	0.0
Total			0.0	0.3
Other Restructuring | Payment & Merchandising Technologies
Restructuring Cost and Reserve [Line Items]
Severance			0.0	0.3
Other			0.0	0.0
Total			$ 0.0	$ 0.3