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Quarterly Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                      
Charge (credit) for termination of pellet agreement and related transportation costs                 $ (19.3) $ 69.5 $ 0.0
Asset impairment charge                 75.6 0.0 0.0
Credit for U.S. tax legislation $ (4.3)               (4.3)    
Pension/OPEB corridor charge/credit                 0.0 (43.1) (131.2)
Pension settlement charges                 0.0 25.0 0.0
Net sales 1,495.6 $ 1,494.3 $ 1,557.2 $ 1,533.4 $ 1,418.6 $ 1,452.9 $ 1,492.2 $ 1,518.8 6,080.5 5,882.5 6,692.9
Operating profit (loss) (52.3) 66.3 116.5 129.7 42.3 89.6 69.0 16.7 260.2 217.6 (67.4)
Net income (loss) attributable to AK Holding $ (80.4) $ 22.3 $ 77.2 $ 84.4 $ (46.7) $ 27.8 $ 27.8 $ (25.7) $ 103.5 $ (16.8) $ (652.3)
Basic earnings (loss) per share (in dollars per share) $ (0.26) $ 0.07 $ 0.25 $ 0.27         $ 0.33 $ (0.07) $ (3.67)
Earnings Per Share, Diluted (in dollars per share) $ (0.26) $ 0.07 $ 0.24 $ 0.26         $ 0.32 $ (0.07) $ (3.67)
Basic and diluted earnings (loss) per share (in dollars per share)         $ (0.16) $ 0.12 $ 0.13 $ (0.14)      
Pension Plans, Defined Benefit [Member]                      
Business Acquisition [Line Items]                      
Pension/OPEB corridor charge/credit         $ (78.4)       $ 0.0 $ (78.4) $ (144.3)
Pension settlement charges         25.0         25.0  
Other Postretirement Benefit Plans, Defined Benefit [Member]                      
Business Acquisition [Line Items]                      
Pension/OPEB corridor charge/credit                 0.0 35.3 $ 13.1
Ashland Works Hot End [Member]                      
Business Acquisition [Line Items]                      
Asset impairment charge $ 75.6               75.6    
Iron Ore Pellets Agreements [Member]                      
Business Acquisition [Line Items]                      
Charge (credit) for termination of pellet agreement and related transportation costs $ (19.3)       $ 69.5       $ (19.3) $ 69.5