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Equity Dividends Paid (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stockholders' Equity Attributable to Parent [Abstract]        
Dividends, Common Stock, Cash $ 1.8 $ 1.8 $ 3.5 $ 3.5