Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Loss) (Details Textual)

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Comprehensive Income (Loss) (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Comprehensive Income and Loss (Textual) [Abstract]        
Other comprehensive income (loss) $ 0 $ 0 $ 0 $ 0
Comprehensive income (loss) $ 5.1 $ 1.7 $ 11.1 $ 6.9