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Property, Plant And Equipment (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant And Equipment [Abstract]      
Total accumulated depreciation $ 515.1   $ 502.9
Unpaid capital expenditure liabilities $ 3.8 $ 3.8