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Stock-Based Compensation (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation costs for equity awards	$ 7.7	$ 7.1	$ 6.5
Compensation costs related to non-vested awards not yet recognized	8.9
Weighted average period over which non-vested awards will be recongized	1.2
Income tax benefit recognized	2.6	2.5	1.8
Total income tax benefit realized from exercise of equity awards	$ 5.0	$ 4.3	$ 2.6

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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