Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow Information (Textuals)
Interest paid, net of amounts capitalized	$ 241.2	$ 234.0	$ 198.0
Net refunds from income taxes	107.0	109.1
Income taxes paid, net of refunds			166.7
Accounts payable related to capital expenditures	15.7	16.7	18.2
Deferred Revenue, Revenue Recognized	$ 54.9	$ 54.4	$ 34.6