Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Combination, Integration Related Costs	$ 4.7	$ 0.5	$ 2.6						$ 0.0	$ 0.0	$ 7.2
Net sales	714.2	695.9	702.5	$ 673.4	$ 681.6	$ 694.2	$ 712.2	$ 660.0	2,786.0	2,748.0	2,740.5
Cost of sales	455.6	441.5	444.3	429.5	433.9	449.2	449.1	426.1	1,770.9	1,758.3	1,786.1
Gross profit	258.6	254.4	258.2	243.9	247.7	245.0	263.1	233.9	1,015.1	989.7
Operating profit from continuing operations	90.9	105.4	109.0	96.6	(91.6)	103.8	102.6	85.5	401.9	200.3	372.9
Income from continuing operations attributable to common shareholders					(63.9)	$ 63.5	$ 68.2	$ 55.0		122.8
Net income attributable to common shareholders	$ (28.7)	$ 68.2	$ 69.2	$ 63.1					171.8	122.8	228.9
Earnings per diluted share
Restructuring charges									13.0	0.0	7.8
Asbestos provision					$ 0.0				$ 0.0	$ 192.4	$ 0.0
Earnings Per Share, Basic	$ (0.48)	$ 1.15	$ 1.16	$ 1.06	$ (1.11)	$ 1.09	$ 1.17	$ 0.95	$ 2.89	$ 2.10	$ 3.94
Earnings Per Share, Diluted	$ (0.48)	$ 1.13	$ 1.14	$ 1.05	$ (1.08)	$ 1.07	$ 1.15	$ 0.93	$ 2.84	$ 2.07	$ 3.89
Huttig [Domain]
Litigation Settlement, Amount						$ 5.0	$ 5.0