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 [Abstract]
Capitalized interest expense	$ 2.7	$ 3.5	$ 0.9
Cash paid for interest	217.9	211.8	172.4
Cash paid (received) for income taxes, net of refunds	0.1	(1.2)	3.5
Capital Lease Obligations and Other Financing Arrangements Incurred	19.9	49.7	21.0
Acquisition of property on account	30.7	22.8	9.6
Payments of Stock Issuance Costs	$ 2.2	$ 0	$ 0