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Income Taxes - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Effective income tax rate   (311.10%) 2.20%  
Decrease in income tax expense   $ 782,600,000    
Income tax benefit from reorganization $ 876,100,000 876,114,000 $ 0 $ 0
Decrease in differences in tax filings from provision   16,800,000    
Decrease in income tax expense of federal rate applied to pretax income   10,900,000    
Decrease in nontaxable items   7,000,000    
Decrease in deferred tax assets valuation allowance, amount   5,000,000    
Increase resulting from the impact of foreign tax rates   80,100,000    
Increase in deferred tax asset valuation allowance     35,500,000  
Increase related to reversal of reserves     14,700,000  
Operating Loss Carryforwards [Line Items]        
Investment tax credit   49,100,000    
Unrecognized tax benefit   11,600,000    
Net unrecognized tax benefit excluding deferred tax assets   163,000,000 150,900,000  
Increase in unrecognized tax benefits resulting from prior year positions, subject to recovery as an indemnified asset   9,400,000 0  
Possible decrease in tax expense in next 12 months   1,900,000    
Taxes paid on cash distribution   22,100,000 $ 15,900,000  
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforward   83,400,000    
Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforward   294,000,000    
Non-capital loss carryforwards with no expiration date   $ 68,600,000