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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount $ 14.6 $ 7.2    
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)       $ 12.6
Statutory federal rate     21.00%  
Foreign Earnings Repatriated     $ 249.0  
foreign withholding tax     $ 13.1