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Common Stock (Share-Based Compensation and Treasury Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended
	Jun. 30, 2012	Nov. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Nov. 30, 2012
Common Stock [Abstract]
Non-cash share-based compensation expense			$ 13.4	$ 7.4	$ 4.7
Common stock shares purchased by the company			166,334	57,303
Return of borrowed shares under share-based, shares	659,340	701,102	659,340	701,102
Number of shares authorized to be repurchased						25,000,000

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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