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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Jun. 30, 2015
Deferred tax assets:    
Foreign tax credit carryforwards $ 136.9  
Foreign tax credit carryforward period   10 years
Foreign tax credit carryforward deferred tax assets    
Deferred tax assets:    
Additional valuation allowance $ 7.2  
Foreign tax credit carryforward deferred tax assets | Spin-off | Pro Forma | Minimum    
Deferred tax assets:    
Additional valuation allowance   $ 45.0
Foreign tax credit carryforward deferred tax assets | Spin-off | Pro Forma | Maximum    
Deferred tax assets:    
Additional valuation allowance   $ 65.0