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Equity (Details Textual) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Class of Stock [Line Items]      
Proceeds from Issuance or Sale of Equity $ 8.9 $ 8.9 $ 0
Previous Controlling Interest, Ownership Percentage by Controlling Owners in Subsidiary 80.00% 80.00%  
Current Interest, Ownership Percentage by Controlling Owners in Subsidiary 75.00% 75.00%  
Equity (Textual) [Abstract]      
Pension and postretirement liability adjustment, Tax   $ 22.0  
Dividend per share   $ 0.46