Quarterly report pursuant to Section 13 or 15(d)

Accounting Policies (Details)

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Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accounting Policies        
Allocated general corporate costs $ 5.7 $ 5.5 $ 13.6 $ 10.8
Allocated operating expenses $ 1.2 $ 3.2 5.6 $ 8.0
Understatement of Allocation of Corporate Expense        
Correction of error        
Correction or error in current period, amount     $ 1.9