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Income Tax (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2018
Jun. 30, 2018
Valuation Allowance [Line Items]          
Effective tax rate     53.80% 43.60%  
Income tax rate 21.00% 35.00%      
Provisional transition tax before foreign tax credits         $ 55.8
Transition tax liability after generated foreign tax credits         0.0
Accrued interest related to uncertain tax positions     $ 0.1 $ 0.1  
Unrecognized tax benefit     $ 1.0 $ 1.0 $ 0.8
Foreign Cash And Other Net Current Assets [Member]          
Valuation Allowance [Line Items]          
Effective tax rate         15.50%
Foreign Income [Member]          
Valuation Allowance [Line Items]          
Effective tax rate         8.00%