Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Supplemental Cash Flow Information [Abstract]
Capital lease obligations incurred	$ 11.6	$ 9.5
Accrued purchases of property and equipment	15.7	11.0
Interest payments	99.7	100.4
Income tax payments, net of income tax refunds	$ 180.4	$ 155.3