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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parentheticals) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Unrealized hedging gains (losses) and other, tax $ (300,000) $ (700,000) $ (2,000,000.0) $ 2,800,000
Reclassification of deferred hedging gains (losses) and other, included in net income, tax 1,200,000 (400,000) (3,300,000.0) (2,000,000)
Total derivative instruments, tax 900,000 (1,100,000) 1,300,000.0 800,000
Unrealized actuarial gains (losses) and prior service (costs) credits, tax 0 200,000 0.0 (4,500,000)
Reclassification of net actuarial and other (gain) loss and amortization of prior service costs, included in net income, tax 4,700,000 4,400,000 (12,000,000) 16,600,000
Total pension and other postretirement benefits, tax $ 4,700,000 $ 4,600,000 $ (12,000,000) $ 12,100,000