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Property, Plant And Equipment	3 Months Ended
Property, Plant And Equipment	Mar. 31, 2018
Property, Plant And Equipment [Abstract]
Property, Plant And Equipment	6. Property, Plant and Equipment Property, plant and equipment is reported net of accumulated depreciation of $522.0 million at March 31, 2018, and $502.9 million at December 31, 2017. Unpaid capital expenditure liabilities, which are non-cash investing activities, were $4.8 million at March 31, 2018, and $2.5 million at March 31, 2017.