Other Financial Information, Restructuring (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 7.9	$ 9.4
Charges	17.1	10.8	19.5
Cash payments	(18.6)	(8.0)
Non-cash settlements and other adjustments	(2.3)	(4.3)
Ending Balance	4.1	7.9	9.4
Facilities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	7.7	4.9
Charges	0.2	6.9
Cash payments	(5.3)	(2.5)
Non-cash settlements and other adjustments	(1.6)	(1.6)
Ending Balance	1.0	7.7
Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0.2	4.5
Charges	16.9	3.9
Cash payments	(13.3)	(5.5)
Non-cash settlements and other adjustments	(0.7)	(2.7)
Ending Balance	$ 3.1	$ 0.2