Fair value as of the balance sheet date of credit risk derivative assets, net of credit risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Interest rate stated in the contractual debt agreement.

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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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Aggregate notional amount of all derivatives designated as a hedge of a net investment in a foreign operation. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

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Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

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Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

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Financial Instruments and Risk Management (Narrative) (Details)	6 Months Ended						6 Months Ended
	Jun. 30, 2011 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 EUR (€)	Dec. 31, 2010 USD ($)	Dec. 31, 2010 EUR (€)	Jun. 30, 2011 Credit Risk Related Contingent Features [Member] USD ($)	Jun. 30, 2011 2018 Senior Notes [Member] USD ($)	Jun. 30, 2011 Floating-Rate Debt Interest Rate Swaps [Member] USD ($)	Dec. 31, 2010 Floating-Rate Debt Interest Rate Swaps [Member] USD ($)	Jun. 30, 2011 Fixed-Rate Debt Interest Rate Swaps [Member] USD ($)
Borrowings under senior credit agreement that are designated as a hedge of net investment	$ 986,200,000		€ 679,200,000	$ 909,300,000	€ 679,200,000
Principal amount of debt instrument							500,000,000
Interest rate on senior note							6.00%
Debt instrument, maturity date							Nov. 15, 2018
Total notional amount of interest rate swaps								500,000,000	767,700,000	500,000,000
Aggregate fair value of all derivative contracts that are in liability position						21,100,000
Total fair value of convertible note hedge	581,400,000
Gain or loss recognized into earnings on derivatives with net investment hedging relationships	$ 0	$ 0