Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other cash flow information including acquisitions
Estimated fair value of tangible assets acquired	$ 203.5	$ 88.2	$ 115.1
Goodwill and identifiable intangible assets acquired	588.2	280.1	420.9
Net Payments made for acquisitions, net of cash acquired	(503.3)	(342.6)	(392.1)
Liabilities assumed, including deferred tax liabilities	288.4	25.7	143.9
Interest paid, net of amount capitalized	130.9	123.8	114.8
Income taxes paid, net of refunds received	$ 73.0	$ 142.6	$ 38.9