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Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Supplemental Cash Flow Information [Abstract]    
Property acquired under capital leases $ 7.3 $ 19.1
Interest payments 68.4 55.4
Income tax payments, net of income tax refunds $ 112.9 $ 90.2