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Parent Company Statements - Narrative (Details) (Parent Company, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Parent Company
     
Income taxes $ 4.54 $ 4.21 $ 5.97
Undistributed earnings, restricted from transfer as dividends $ 173.1 $ 146.6