Earnings Per Common Share (Narrative) (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Common Share
Reduction in net income attributable to common shareholders	$ 0.4	$ 0.4	$ 0.8	$ 0.7
Option to purchase common stock shares not included in the computation of diluted EPS	0.7	2.4	0.7	2.4

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