Business Combinations (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Acquisitions of new subsidiaries	8
Goodwill, Acquisitions	$ 144.7	$ 222.4
Goodwill recorded in acquisitions expected to be deductible for income tax purposes	28.3
Liability for contingent purchase price obligations	322.0	300.7
Liability for contingent purchase price obligations, current	$ 81.5	$ 105.5