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Business Segments (Details4) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Long-Lived Assets [Line Items]
Sales	$ 1,037.9	$ 1,020.2	$ 1,009.5	$ 979.0	$ 909.9	$ 869.1	$ 880.2	$ 865.9	$ 4,046.6	$ 3,525.1	$ 3,134.6
Identifiable Assets	$ 5,501.8				$ 5,185.4				$ 5,501.8	$ 5,185.4	$ 5,170.0
Percent of total	100.00%				100.00%				100.00%	100.00%	100.00%
United States
Long-Lived Assets [Line Items]
Sales									$ 2,348.1	$ 2,070.6	$ 1,857.5
Identifiable Assets	$ 4,859.1				$ 4,547.7				$ 4,859.1	$ 4,547.7	$ 4,591.5
Percent of total	88.00%				88.00%				88.00%	88.00%	89.00%
China
Long-Lived Assets [Line Items]
Sales									$ 320.0	$ 265.6	$ 214.1
Identifiable Assets	$ 287.3				$ 276.0				$ 287.3	$ 276.0	$ 249.3
Percent of total	5.00%				5.00%				5.00%	5.00%	5.00%
United Kingdom
Long-Lived Assets [Line Items]
Sales									$ 242.1	$ 231.6	$ 183.8
Identifiable Assets	$ 136.7				$ 122.7				$ 136.7	$ 122.7	$ 122.8
Percent of total	3.00%				2.00%				3.00%	2.00%	2.00%
Germany
Long-Lived Assets [Line Items]
Sales									$ 247.2	$ 217.1	$ 177.7
France
Long-Lived Assets [Line Items]
Sales									183.6	165.6	142.6
Japan
Long-Lived Assets [Line Items]
Sales									214.9	131.7	151.9
Other [Member]
Long-Lived Assets [Line Items]
Identifiable Assets	$ 218.7				$ 239.0				$ 218.7	$ 239.0	$ 206.4
Percent of total	4.00%				5.00%				4.00%	5.00%	4.00%

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