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Share-Based Compensation (Nonvested Shares Activity) (Details) (Restricted Stock and Restricted Stock Units (RSUs) [Member], USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted Stock and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of nonvested shares granted	$ 39.94	$ 24.75	$ 19.13
Fair value of nonvested shares granted	$ 7.9	$ 6.1	$ 5.5
Fair value of shares vested	$ 2.5	$ 2.9	$ 4.2

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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