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Condensed Consolidated Statements of Cash Flows (Parentheticals) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Cash Flows [Abstract]    
Cash paid for interest, net of capitalized interest $ 35.0 $ 22.0
Income taxes paid, net of refunds 12.0 3.4
Net interest payments allocated to discontinued operations   5.3
Tax payments, net of refunds, allocated to discontinued operations   1.4
Non-cash additions to property, plant and equipment $ 4.6 $ 3.1