Business Combinations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Acquisitions of new subsidiaries	8
Goodwill, Acquisitions	$ 69.9	$ 301.1
Accrued contingent purchase price payments included in goodwill	14.5
Goodwill recorded in acquisitions expected to be deductible for income tax purposes	38.1
Liability for contingent purchase price obligations	220.2	266.2
Liability for contingent purchase price obligations, current	$ 74.5	$ 83.2