Other Liabilities, Noncurrent (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Other Liabilities, Noncurrent Disclosure [Abstract]
Income Taxes Payable	$ 111.4	$ 130.0
Deferred Revenue	14.2	14.1
Deferred Rent	11.8	12.8
Insurance Provisions	15.5	13.5
Other Noncurrent Liabilities	20.7	20.4
Other Liabilities, Noncurrent, Total	$ 173.6	$ 190.8