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Share-Based Compensation Expense (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
Share-based Arrangements with Employees and Nonemployees [Abstract]
Share-based compensation expense	$ 4.0	$ 4.0	$ 7.5	$ 6.1
Share-based compensation expense recorded in cost of sales	$ 0.2	$ 0.6	$ 0.1	$ 1.0

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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