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Share-Based Compensation And Capital Stock Pre-Tax Stock-Based Compensation Expenses And Associated Income Tax Benefits (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pre-tax stock-based compensation expenses	$ 2.7	$ 1.8	$ 8.0	$ 6.8
Income tax benefits	1.0	0.7	3.0	2.5
Stock Options [Member]
Pre-tax stock-based compensation expenses	0.7	0.7	2.0	1.9
Restricted Stock [Member]
Pre-tax stock-based compensation expenses	1.9	1.8	5.6	5.3
Performance Vested Restricted Stock Units [Member]
Pre-tax stock-based compensation expenses	$ 0.1	$ (0.7)	$ 0.4	$ (0.4)

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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