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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Federal statutory tax rate   35.00% 35.00% 35.00%
Foreign withholding taxes recorded based on a change in the indefinite reinvestment assertion   $ 2.1    
Effect of Tax Cuts and Jobs Act of 2017        
Provisional increase to deferred tax expense   261.3    
Provisional transition tax liability   $ 2.6    
Period of time over which TCJA transition tax on certain unrepatriated earnings of foreign subsidiaries may be paid   8 years    
Forecast        
Federal statutory tax rate 21.00%