Fair Value (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Assets:
Cash and cash equivalents	$ 1,356.0		$ 2,388.1
Short-term investments	6.1		2.2
Available-for-sale securities	5.1		4.9
Interest rate and foreign currency derivative instruments	72.6		43.1
Cost method investments	21.6		21.8
Liabilities:
Short-term borrowings	14.1		7.2
Foreign currency derivative instruments	0.3		0.4
Contingent purchase price obligations	306.0		300.7
Debt	4,642.9		4,754.9
Carrying Amount
Assets:
Cash and cash equivalents	1,356.0		2,388.1
Short-term investments	6.1		2.2
Available-for-sale securities	5.1		4.9
Interest rate and foreign currency derivative instruments	72.6		43.1
Cost method investments	21.6		21.8
Liabilities:
Short-term borrowings	14.1		7.2
Foreign currency derivative instruments	0.3		0.4
Contingent purchase price obligations	306.0		300.7
Debt	4,553.0		4,563.0
Contingent purchase price obligations
Changes in Level 3 Contingent Purchase Price Obligations [Roll Forward]
January 1	300.7	$ 220.2
Acquisitions	51.6	90.8
Revaluation and interest	3.8	0.1
Payments	(42.3)	(43.7)
Foreign currency translation	(7.8)	4.3
June 30	306.0	$ 271.7
Fair Value, Measurements, Recurring [Member]
Assets:
Cash and cash equivalents	1,356.0		2,388.1
Short-term investments	6.1		2.2
Available-for-sale securities	5.1		4.9
Interest rate and foreign currency derivative instruments	72.6		43.1
Liabilities:
Foreign currency derivative instruments	0.3		0.4
Contingent purchase price obligations	306.0		300.7
Fair Value, Measurements, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	1,356.0		2,388.1
Short-term investments	6.1		2.2
Available-for-sale securities	5.1		4.9
Fair Value, Measurements, Recurring [Member] | Level 2
Assets:
Interest rate and foreign currency derivative instruments	72.6		43.1
Liabilities:
Foreign currency derivative instruments	0.3		0.4
Fair Value, Measurements, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 306.0		$ 300.7