Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Supplemental Cash Flow Information [Abstract]
Property acquired under capital leases	$ 2.0	$ 7.3
Accrued purchases of property and equipment	13.8	7.3
Interest payments	67.8	68.4
Income tax payments, net of income tax refunds	$ 140.6	$ 112.9