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Supplemental Cash Flow and Noncash Investing Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Cash Flow Information
Interest paid	$ 152.7	$ 152.6	$ 151.0
Income taxes (refunded) paid, net	(2.8)	13.0	11.3
Noncash Investing Transactions
Aggregate fair value of liquidating distributions	$ 88.8

The fair value of assets acquired in noncash investing or financing activities.

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- Definition

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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