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Stock-Based Compensation (Components of Stock-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation, equity classified awards	$ 1.2	$ 2.2	$ 7.1	$ 8.8
Stock-based compensation, liability classified awards	(0.8)	1.9	(0.9)	2.4
Pre-tax compensation expense	0.4	4.1	6.2	11.2
Tax provision	(0.2)	(1.6)	(2.4)	(4.3)
Total stock-based compensation expense, net of tax	$ 0.2	$ 2.5	$ 3.8	$ 6.9

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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