Fair Value (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Assets:
Cash and cash equivalents	$ 1,427.5		$ 2,388.1
Short-term investments	2.5		2.2
Available-for-sale securities	5.0		4.9
Interest rate and foreign currency derivative instruments	92.1		43.1
Cost method investments	21.6		21.8
Liabilities:
Short-term borrowings	9.7		7.2
Interest rate and foreign currency derivative instruments	16.3		0.4
Contingent purchase price obligations	327.7		300.7
Debt	4,692.3		4,754.9
Carrying Amount
Assets:
Cash and cash equivalents	1,427.5		2,388.1
Short-term investments	2.5		2.2
Available-for-sale securities	5.0		4.9
Interest rate and foreign currency derivative instruments	92.1		43.1
Cost method investments	21.6		21.8
Liabilities:
Short-term borrowings	9.7		7.2
Interest rate and foreign currency derivative instruments	16.3		0.4
Contingent purchase price obligations	327.7		300.7
Debt	4,605.6		4,563.0
Contingent purchase price obligations
Changes in Level 3 Contingent Purchase Price Obligations [Roll Forward]
January 1	300.7	$ 220.2
Acquisitions	68.2	103.1
Revaluation and interest	26.3	0.1
Payments	(55.6)	(74.5)
Foreign currency translation	(11.9)	(7.9)
September 30	327.7	$ 241.0
Fair Value, Measurements, Recurring [Member]
Assets:
Cash and cash equivalents	1,427.5		2,388.1
Short-term investments	2.5		2.2
Available-for-sale securities	5.0		4.9
Interest rate and foreign currency derivative instruments	92.1		43.1
Liabilities:
Interest rate and foreign currency derivative instruments	16.3
Foreign currency derivative instruments			0.4
Contingent purchase price obligations	327.7		300.7
Fair Value, Measurements, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	1,427.5		2,388.1
Short-term investments	2.5		2.2
Available-for-sale securities	5.0		4.9
Fair Value, Measurements, Recurring [Member] | Level 2
Assets:
Interest rate and foreign currency derivative instruments	92.1		43.1
Liabilities:
Interest rate and foreign currency derivative instruments	16.3
Foreign currency derivative instruments			0.4
Fair Value, Measurements, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 327.7		$ 300.7