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Share-Based Compensation Stock Options (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 7.5	$ 8.0
Deferred share-based compensation on restricted share awards and restricted stock unit awards	4.3
Cash flow from income tax benefits in excess of recognized compensation expense	$ 8.1	$ 5.3
Shares available for future grant (in shares)	6,750,294

Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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