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Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			2
Net Sales [Abstract]
Net Sales	$ 279.3	$ 256.4	$ 795.0	$ 784.3
Percentage of total net sales (percent)	100.00%	100.00%	100.00%	100.00%
Operating Profit [Abstract]
Operating Profit	$ 37.0	$ 34.6	$ 105.5	$ 109.2
Percentage of total operating profit (percent)	100.00%	100.00%	100.00%	100.00%
Segment Assets	$ 1,590.6		$ 1,590.6		$ 1,471.7
AMS
Net Sales [Abstract]
Net Sales	138.9	$ 126.1	394.6	$ 373.3
EP
Net Sales [Abstract]
Net Sales	140.4	130.3	400.4	411.0
Operating Segments | AMS
Net Sales [Abstract]
Net Sales	$ 138.9	$ 126.1	$ 394.6	$ 373.3
Percentage of total net sales (percent)	49.70%	49.20%	49.60%	47.60%
Operating Profit [Abstract]
Operating Profit	$ 18.5	$ 19.3	$ 45.3	$ 54.6
Percentage of total operating profit (percent)	50.00%	55.80%	42.90%	50.00%
Segment Assets	$ 955.5		$ 955.5		781.2
Operating Segments | EP
Net Sales [Abstract]
Net Sales	$ 140.4	$ 130.3	$ 400.4	$ 411.0
Percentage of total net sales (percent)	50.30%	50.80%	50.40%	52.40%
Operating Profit [Abstract]
Operating Profit	$ 28.2	$ 27.3	$ 93.3	$ 88.5
Percentage of total operating profit (percent)	76.20%	78.90%	88.40%	81.00%
Segment Assets	$ 484.0		$ 484.0		512.4
Unallocated
Operating Profit [Abstract]
Operating Profit	$ (9.7)	$ (12.0)	$ (33.1)	$ (33.9)
Percentage of total operating profit (percent)	(26.20%)	(34.70%)	(31.30%)	(31.00%)
Segment Assets	$ 151.1		$ 151.1		$ 178.1

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