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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation, Percent 14.00% 12.00%
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount $ 11.0 $ 5.5
Statutory federal rate 21.00% 21.00%
Foreign Earnings Repatriated $ 249.0  
foreign withholding tax $ 13.1