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Interest Income, Expense and Other Financing Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Interest Income, Expense and Other Financing Costs        
Interest income $ 1.3 $ 1.5 $ 2.6 $ 3.1
Interest expense and other financing costs (7.7) (6.2) (16.3) (12.1)
Interest expense and other financing costs, net $ (6.4) $ (4.7) $ (13.7) $ (9.0)