Stock-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Schedule of stock -based compensation expense in operations
Compensation expense	$ 15.2	[1]	$ 13.7	[1]	$ 15.4	[1]

[1] Stock-Based Compensation expense is recorded in our Corporate and other business segment.