Business Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Business Segments [Abstract]
Number of business segments	3
Segment Reporting Information [Line Items]
Revenues	$ 1,804.3	$ 1,501.3
Income (loss) before income taxes	171.8	139.9
DPS [Member]
Segment Reporting Information [Line Items]
Revenues	1,042.1	865.7
Income (loss) before income taxes	135.3	116.3
V&M [Member]
Segment Reporting Information [Line Items]
Revenues	491.2	339.9
Income (loss) before income taxes	92.6	55.2
PCS [Member]
Segment Reporting Information [Line Items]
Revenues	271.0	295.7
Income (loss) before income taxes	10.6	30.6
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (66.7)	$ (62.2)