Segment Information Segment Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net Sales	$ 2,713.3	$ 2,864.3		$ 2,779.3	$ 2,411.7	$ 2,601.0	$ 2,623.3	$ 2,584.7	$ 2,319.2	$ 10,768.6	$ 10,128.2	$ 9,602.4
Income (loss) from operations	142.0	92.9	[1]	153.6	120.1	130.9	139.7	136.4	103.6	508.6	510.6	470.7
Depreciation and amortization expense										(208.2)	(210.2)	(204.9)
Segment Reporting Information, Additional Information [Abstract]
Number of Reportable Segments										2
Number of operating segments which do not meet reporting unit quantitative threshold										2
Net Sales	2,713.3	2,864.3		2,779.3	2,411.7	2,601.0	2,623.3	2,584.7	2,319.2	10,768.6	10,128.2	9,602.4
Net sales to the federal government, Percentage										7.00%	10.00%	10.00%
Net sales to customers outside of the US, Percent										4.00%	4.00%	4.00%
Long-Lived Assets in Foreign Countries, Percent	1.00%					2.00%				1.00%	2.00%
IPO- and secondary-offering related expenses										(75.0)	0	0
Corporate [Member]
Segment Reporting Information [Line Items]
Net Sales	1,553.0	1,465.8		1,537.4	1,403.9	1,442.8	1,312.8	1,394.4	1,362.8	5,960.1	5,512.8	5,334.4
Income (loss) from operations										363.3	349.0	331.6
Depreciation and amortization expense										(97.3)	(97.6)	(97.4)
Segment Reporting Information, Additional Information [Abstract]
Net Sales	1,553.0	1,465.8		1,537.4	1,403.9	1,442.8	1,312.8	1,394.4	1,362.8	5,960.1	5,512.8	5,334.4
IPO- and secondary-offering related expenses										(26.4)	0	0
Public [Member]
Segment Reporting Information [Line Items]
Net Sales	990.5	1,244.6		1,082.6	846.8	1,001.3	1,163.7	1,040.4	817.6	4,164.5	4,023.0	3,757.2
Income (loss) from operations										246.5	246.7	233.3
Depreciation and amortization expense										(44.0)	(44.0)	(43.9)
Segment Reporting Information, Additional Information [Abstract]
Net Sales	990.5	1,244.6		1,082.6	846.8	1,001.3	1,163.7	1,040.4	817.6	4,164.5	4,023.0	3,757.2
IPO- and secondary-offering related expenses										(14.4)	0	0
Other [Member]
Segment Reporting Information [Line Items]
Net Sales	169.8	153.9		159.3	161.0	156.9	146.8	149.9	138.8	644.0	592.4	510.8
Income (loss) from operations										27.2	18.6	17.5
Depreciation and amortization expense										(8.6)	(9.3)	(8.7)
Segment Reporting Information, Additional Information [Abstract]
Net Sales	169.8	153.9		159.3	161.0	156.9	146.8	149.9	138.8	644.0	592.4	510.8
IPO- and secondary-offering related expenses										(3.6)	0	0
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Net Sales										0	0	0
Income (loss) from operations										(128.4)	(103.7)	(111.7)
Depreciation and amortization expense										(58.3)	(59.3)	(54.9)
Segment Reporting Information, Additional Information [Abstract]
Net Sales										0	0	0
IPO- and secondary-offering related expenses										$ (30.6)	$ 0	$ 0

[1] The third quarter of 2013 included pre-tax IPO-related charges of $74.1 million. See Note 9 for additional discussion of the IPO.