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Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Supplemental Cash Flow Information [Abstract]    
Property acquired under capital leases $ 0 $ 2.7
Accrued purchases of property and equipment 13.2 9.0
Interest payments 32.2 31.9
Income tax payments, net of income tax refunds $ 8.9 $ 8.9