Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,025.4	$ 923.4
Segment EBIT:
Segment EBITDA	210.6	182.6
Recognition of net actuarial losses (gains)	(0.9)	0.0
Depreciation and amortization	(43.0)	(42.3)
Interest expense	(14.9)	(17.1)
Interest income	0.5	1.5
Income before income taxes	141.3	113.6
Bargain purchase price gain	0.6	0.0
Mobile Industries
Segment Reporting Information [Line Items]
Net sales	504.5	466.7
Segment EBIT:
Segment EBITDA	79.6	75.1
Process Industries
Segment Reporting Information [Line Items]
Net sales	520.9	456.7
Segment EBIT:
Segment EBITDA	131.0	107.5
Corporate Segment
Segment EBIT:
Corporate EBITDA	$ (11.6)	$ (11.1)