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Other Non-current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Other Liabilities, Noncurrent [Abstract]    
Income taxes payable $ 79.9 $ 78.3
Deferred revenue 12.8 12.2
Deferred rent 14.1 14.0
Insurance provisions 14.2 14.5
Other non-current liabilities 26.3 25.3
Other noncurrent liabilities, total $ 147.3 $ 144.3