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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Cash Flow Information [Abstract]
Capitalized interest expense	$ 3.5	$ 0.9	$ 2.2
Cash paid for interest	211.8	172.4	118.8
Cash paid (received) for income taxes, net of refunds	(1.2)	3.5	6.0
Acquisition of property by assuming debt and other financing arrangements	49.7	21.0	79.3
Acquisition of property on account	$ 22.8	$ 9.6	$ 13.5

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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