Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Information [Line Items]
Number of Reportable Segments	2
Number of operating segments which do not meet reportable unit quantitative threshold	2
Net sales	$ 2,411.7	$ 2,319.2
Income (loss) from operations	120.1	103.6
Depreciation and amortization expense	(52.0)	(52.5)
Corporate [Member]
Segment Information [Line Items]
Net sales	1,403.9	1,362.8
Income (loss) from operations	94.1	84.8
Depreciation and amortization expense	(24.4)	(24.3)
Public [Member]
Segment Information [Line Items]
Net sales	846.8	817.6
Income (loss) from operations	45.6	42.1
Depreciation and amortization expense	(11.0)	(11.0)
Other [Member]
Segment Information [Line Items]
Net sales	161.0	138.8
Income (loss) from operations	6.1	2.5
Depreciation and amortization expense	(2.3)	(2.3)
Headquarters [Member]
Segment Information [Line Items]
Net sales	0	0
Income (loss) from operations	(25.7)	(25.8)
Depreciation and amortization expense	$ (14.3)	$ (14.9)