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Condensed Consolidated Statements of Cash Flows (Parentheticals) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Cash Flows [Abstract]    
Cash paid for interest, net of capitalized interest $ 35,800,000 $ 35,000,000.0
Income taxes paid, net of refunds 34,100,000 12,000,000.0
Net interest payments allocated to discontinued operations   0
Tax payments, net of refunds, allocated to discontinued operations   3,300,000
Non-cash additions to property, plant and equipment $ 600,000 $ 300,000