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Quarterly Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]                        
Impairment of Magnetation investment $ 0.0       $ 256.3         $ 256.3 $ 0.0 $ 0.0
Impairment of AFSG investment                   41.6 0.0 0.0
Charge for facility idling                   28.1 0.0 0.0
Pension/OPEB corridor charge/credit                   131.2 2.0 0.0
Net sales 1,518.8 $ 1,542.7 $ 1,709.9 $ 1,689.4 1,750.9 $ 1,997.6 $ 1,593.8 $ 1,530.8 $ 1,383.5 6,692.9 6,505.7 5,570.4
Operating profit (loss) 48.0 (34.4) 80.2 7.1 33.8 74.5 63.7 36.5 (35.3) 86.7 139.4 135.8
Net income (loss) attributable to AK Holding $ (13.6) $ (145.4) $ 6.7 $ (64.0) $ (306.3) $ 13.5 $ (7.2) $ (17.1) $ (86.1) $ (509.0) $ (96.9) $ (46.8)
Basic and diluted earnings (loss) per share (in dollars per share) $ (0.08) $ (0.82) $ 0.04 $ (0.36) $ (1.72)         $ (2.86) $ (0.65) $ (0.34)
Basic earnings (loss) per share (0.08)       (1.72) $ 0.08 $ (0.05) $ (0.13) $ (0.63) (2.86) (0.65) (0.34)
Diluted earnings (loss) per share $ (0.08)       $ (1.72) $ 0.07 $ (0.05) $ (0.13) $ (0.63) $ (2.86) $ (0.65) $ (0.34)
Severstal Dearborn [Member]                        
Business Acquisition [Line Items]                        
Business Combination, Additional Disclosures, Acquisition Related Costs           $ 7.1 $ 23.6 $ 1.0     $ 31.7  
Pension Plans, Defined Benefit [Member]                        
Business Acquisition [Line Items]                        
Pension/OPEB corridor charge/credit   $ 144.3       $ 2.0       $ 144.3 2.0 $ 0.0
Other Postretirement Benefit Plans, Defined Benefit [Member]                        
Business Acquisition [Line Items]                        
Pension/OPEB corridor charge/credit   (13.1)               $ (13.1) $ 0.0 $ 0.0
AFSG Holdings Inc [Member]                        
Business Acquisition [Line Items]                        
Impairment of AFSG investment   $ 41.6