Fair Value Measurements (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Fair value of our credit facility, term loan and senior notes	$ 834,100,000
Carrying value of our credit facility, term loan and senior notes	871,300,000
Transfers of assets or liabilities between Level 1 and Level 2	$ 0	$ 0
2.58% Senior Euro Notes [Member]
Stated interest rate	2.58%
4.5% Senior Notes [Member]
Stated interest rate	4.50%