Reportable Business Segments (Geographic Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total net sales to external customers	$ 897.3	$ 1,010.0	$ 1,019.2	$ 715.2	$ 834.1	$ 955.0	$ 992.5	$ 685.8	$ 3,641.6	$ 3,467.4	$ 3,367.4
Total property, plant and equipment, net	361.4				339.6				361.4	339.6	358.6
United States [Member]
Segment Reporting Information [Line Items]
Total net sales to external customers									2,966.8	2,793.4	2,576.4
Total property, plant and equipment, net	237.6				224.8				237.6	224.8	243.4
Mexico [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment, net	69.4				60.0				69.4	60.0	52.4
Canada [Member]
Segment Reporting Information [Line Items]
Total net sales to external customers									218.8	217.7	236.3
Total property, plant and equipment, net	1.4				1.2				1.4	1.2	0.6
International [Member]
Segment Reporting Information [Line Items]
Total net sales to external customers									456.0	456.3	554.7
Total property, plant and equipment, net	$ 53.0				$ 53.6				$ 53.0	$ 53.6	$ 62.2