Goodwill and Identifiable Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Amortization expense of intangible assets
Amortization expense of intangible assets acquired	$ 34.2	$ 2.5
Remaining estimated future amortization expense
2012	101.5
2013	133.8
2014	132.2
2015	104.3
2016	98.5
2017	97.3
Thereafter	524.0
Total	1,191.6
Goodwill and Identifiable Intangible Assets (Textual) [Abstract]
Intangible assets having indefinite useful lives	$ 911