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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, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pre-tax stock-based compensation expenses	$ 2.9	$ 2.8
Income tax benefits	1.1	1.0
Stock Options [Member]
Pre-tax stock-based compensation expenses	0.5	0.6
Restricted Stock [Member]
Pre-tax stock-based compensation expenses	1.8	2.0
Performance Vested Restricted Stock Units [Member]
Pre-tax stock-based compensation expenses	$ 0.6	$ 0.2

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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