Reportable Business Segments (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Summary of financial information relating to geographic area based operations
Total net sales to external customers	$ 812.8	$ 898.4	$ 960.7	$ 695.4	$ 749.5	$ 868.0	$ 913.1	$ 668.4	$ 3,367.4	[1]	$ 3,199.1	[1]	$ 2,949.4	[1]
Total property, plant and equipment, net	358.6				335.5				358.6		335.5		298.2
United States [Member]
Summary of financial information relating to geographic area based operations
Total net sales to external customers									2,576.4		2,382.0		2,147.2
Total property, plant and equipment, net	243.4				230.3				243.4		230.3		227.9
Mexico [Member]
Summary of financial information relating to geographic area based operations
Total property, plant and equipment, net	52.4				39.7				52.4		39.7		28.0
Canada [Member]
Summary of financial information relating to geographic area based operations
Total net sales to external customers									236.3		232.3		226.7
Total property, plant and equipment, net	0.6				0.6				0.6		0.6		0.6
International [Member]
Summary of financial information relating to geographic area based operations
Total net sales to external customers									554.7		584.8		575.5
Total property, plant and equipment, net	$ 62.2				$ 64.9				$ 62.2		$ 64.9		$ 41.7

[1] On a consolidated basis, no revenue from transactions with a single customer were 10% or greater of our consolidated net sales for any of the periods presented.