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Stock Options (Compensation Expense Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Options Compensation Expense Narrative Details
Compensation expense on share based awards	$ 3.0	$ 1.9
Unrecognized compensation cost	$ 17.9
Weighted average period over which unrecognized compensation is expected to be recognized, in years	2.86

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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