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Other Non-current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Other Liabilities, Noncurrent [Abstract]    
Income taxes payable $ 78.3 $ 130.0
Deferred revenue 12.2 14.1
Deferred rent 14.0 12.8
Insurance provisions 14.5 13.5
Other non-current liabilities 25.3 20.4
Other noncurrent liabilities, total $ 144.3 $ 190.8