Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.8.0.1
Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Jun. 30, 2018
Effective Income Tax Reconciliation [Line Items]      
Decrease in income taxes related to reduction of U.S. federal corporate tax rate $ 13.0 $ 37.3  
Decrease in income taxes from expiration of the statute of limitations 10.1    
Increase in income taxes relating to transition tax 4.7 345.6  
Increase in income tax expense from re-measurement of deferred tax assets and liabilities   100.4  
Provisional tax amount included as a component of income tax expense from continuing operations 4.0 446.0  
Transition tax   345.6  
Increase in income tax expense from re-measurement of deferred tax assets and liabilities   100.4  
Amount of unrecorded benefit $ 10.0 $ 10.0  
Forecast      
Effective Income Tax Reconciliation [Line Items]      
U.S. federal corporate tax rate     28.10%