Stock-Based Compensation (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	[1]	$ 7.3	$ 6.9	$ 10.8	$ 10.7

[1] All expense was recorded in our Corporate and other business segment.