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Significant Accounting Policies Stock Based Compensation expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Significant Accounting Policies [Abstract]
Allocated Share-based Compensation Expense	$ 4.1	$ 5.3	$ 13.0	$ 15.7

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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