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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Income Taxes - Additional Information [Line Items]                  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       35.00%          
Provisional tax expense for the deemed repatriation of undistributed foreign earnings       $ 77.0 $ 83.0        
Estimated cash payment related to provisional tax expense for the deemed repatriation of undistributed foreign earnings $ 6.4       6.4        
Income Taxes Payable, long-current 5.9       $ 5.9        
Provisional tax expense for the deemed repatriation of undistributed foreign earnings, Increase (decrease) $ 6.0                
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 3.9              
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   2.9              
Overstatement of deferred tax assets                 $ 8.2
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent         2.80%        
Income Tax (Textual) [Abstract]                  
Effective tax rate 31.20%   19.00%   27.50% 45.90%      
Scenario, Forecast [Member]                  
Income Taxes - Additional Information [Line Items]                  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent             21.00% 28.10%  
Income Tax Expense (Benefit) [Member]                  
Income Taxes - Additional Information [Line Items]                  
Quantifying Misstatement in Current Year Financial Statements, Amount   $ 5.3