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Accumulated Other Comprehensive Loss (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Adoption of ASU 2018-02 $ (0.8)
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Adoption of ASU 2018-02 $ 43.5