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]
Cash paid for interest	$ 138.9		$ 139.8		$ 138.6
Cash paid for income taxes, net of refunds	102.0	[1]	87.3	[1]	57.3	[1]
Proceeds from Income Tax Refunds	$ 25.4		$ 28.7		$ 55.0

[1] Refunds of $25.4, $28.7 and $55.0 were received for the years ended December 31, 2011, 2010 and 2009, respectively.