Financial Instruments (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Notional value of forward currency and option contracts	$ 209,700,000	$ 182,700,000
Commercial paper, at carrying value		80,500,000
Line of credit facility, borrowing capacity	400,000,000
Line of credit facility, expiration date	June 2012
Line of credit facility, years	5
Outstanding borrowings	0
Commercial paper borrowings	0
Delays in collection of accounts receivable associated with national healthcare system in Greece	14,300,000	32,800,000
Bonds in settlement of accounts receivable	16.6
Fair Value, Inputs, Level 2 [Member]
Fair value of long-term debt	997,400,000	937,700,000
Interest Rate Swap Contract [Member]
Notional value of interest rate swap contract	$ 250,000,000
Fixed-rate notes interest percentage	2.875%
Fixed-rate notes due date	2016

Bonds in settlement of accounts receivable.

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Commercial paper borrowings.

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- Definition

Fixed-rate notes due date.

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- Definition

Line of credit facility years.

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- Definition

Outstanding borrowings.

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- Definition

Unsecured short-term debt instrument issued by corporations which are 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. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3052-108585

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity 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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- Definition

Interest rate stated in the contractual debt agreement.

+ References

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
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-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 15D
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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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-Name Regulation S-X (SX)
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-Subparagraph (SX 210.5-02.19(b),22(b))
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- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

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-Publisher FASB
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-Paragraph 2, 4
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- Definition

Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

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- Definition

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

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