Reportable Business Segments (Geographic Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total net sales to external customers	$ 834.1	$ 955.0	$ 992.5	$ 685.8	$ 812.8	$ 898.4	$ 960.7	$ 695.4	$ 3,467.4	$ 3,367.4	$ 3,199.1
Total property, plant and equipment, net	339.6				358.6				339.6	358.6	335.5
United States [Member]
Segment Reporting Information [Line Items]
Total net sales to external customers									2,793.4	2,576.4	2,382.0
Total property, plant and equipment, net	224.8				243.4				224.8	243.4	230.3
Mexico [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment, net	60.0				52.4				60.0	52.4	39.7
Canada [Member]
Segment Reporting Information [Line Items]
Total net sales to external customers									217.7	236.3	232.3
Total property, plant and equipment, net	1.2				0.6				1.2	0.6	0.6
International [Member]
Segment Reporting Information [Line Items]
Total net sales to external customers									456.3	554.7	584.8
Total property, plant and equipment, net	$ 53.6				$ 62.2				$ 53.6	$ 62.2	$ 64.9