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Income Taxes (Details) - USD ($)
6 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Net operating loss carryforwards   $ 344,000,000  
Valuation allowance   0 $ 0
Information regarding income tax examinations [Abstract]      
Total amount of unrecognized tax benefits   144,900,000  
Approximate net cash outflows associated with our settlement   $ 57,000,000  
Scenario, Forecast      
Subsequent Event [Line Items]      
Decrease in unrecognized tax benefits upon settlement of IRS dispute $ 144,900,000