Fair Value (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Assets:
Short-term investments	$ 18.2	$ 20.6
Available-for-sale securities	4.9	3.9
Liabilities:
Contingent purchase price obligations	220.2	266.2
Contingent purchase price obligations
Changes in Level 3 Contingent Purchase Price Obligations [Roll Forward]
Balance January 1	266.2	142.6
Acquisitions	35.8	165.2
Payments	(70.5)	(32.2)
Foreign currency translation	(0.4)	3.8
Balance December 31	220.2	266.2
Contingent purchase price obligations \| Interest Expense [Member]
Changes in Level 3 Contingent Purchase Price Obligations [Roll Forward]
Revaluation and interest	(10.9)	(13.2)
Carrying Amount
Assets:
Cash and cash equivalents	2,710.5	2,678.3
Short-term investments	18.2	20.6
Forward foreign exchange contracts	2.2	0.5
Available-for-sale securities	4.9	3.9
Cost method investments	22.2	23.1
Liabilities:
Short-term borrowings	5.9	6.4
Forward foreign exchange contracts	0.1	0
Contingent interest derivative	2.1	0
Contingent purchase price obligations	220.2	266.2
Debt	4,033.8	4,448.9
Fair Value
Assets:
Cash and cash equivalents	2,710.5	2,678.3
Short-term investments	18.2	20.6
Forward foreign exchange contracts	2.2	0.5
Available-for-sale securities	4.9	3.9
Cost method investments	22.2	23.1
Liabilities:
Short-term borrowings	5.9	6.4
Forward foreign exchange contracts	0.1	0
Contingent interest derivative	2.1	0
Contingent purchase price obligations	220.2	266.2
Debt	4,302.7	4,857.3
Fair Value, Measurements, Recurring [Member] \| Level 1
Assets:
Cash and cash equivalents	2,710.5	2,678.3
Short-term investments	18.2	20.6
Available-for-sale securities	4.9	3.9
Fair Value, Measurements, Recurring [Member] \| Level 2
Assets:
Forward foreign exchange contracts	2.2	0.5
Liabilities:
Forward foreign exchange contracts	0.1
Contingent interest derivative	2.1
Fair Value, Measurements, Recurring [Member] \| Level 3
Liabilities:
Contingent purchase price obligations	220.2	266.2
Fair Value, Measurements, Recurring [Member] \| Total
Assets:
Cash and cash equivalents	2,710.5	2,678.3
Short-term investments	18.2	20.6
Forward foreign exchange contracts	2.2	0.5
Available-for-sale securities	4.9	3.9
Liabilities:
Forward foreign exchange contracts	0.1
Contingent interest derivative	2.1
Contingent purchase price obligations	$ 220.2	$ 266.2

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of investments accounted under the cost method.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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