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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 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      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     (3.9)      
Benefit that would have been recorded before the out-of-period adjustment     $ 6.8      
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 8.90%   4.90%      
Income Tax (Textual) [Abstract]            
Effective tax rate 29.30% 50.90% 24.90%      
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