Stock-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012
Schedule of stock -based compensation expense in operations
Compensation expense	$ 7.5	[1]	$ 4.0	[1]	$ 15.2	$ 7.8

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