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Summary Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Payments of Debt Restructuring Costs     $ 10.3 $ 26.4                      
Summary of the unaudited quarterly results of operations                              
Revenues $ 1,440.8 $ 1,207.1 1,040.2 1,027.2 $ 1,313.1       $ 1,418.9 $ 1,339.3 $ 1,537.9 $ 3,564.7 $ 4,715.3 $ 5,609.2 $ 6,792.2
Operating loss (44.9) (21.6) (107.7) (102.7) (470.8)       (20.4) (975.8) 2.2   (276.9) (1,464.8) (135.1)
Loss from continuing operations, net of income taxes (186.2) (95.6) (230.8) (161.7) (497.9)       (144.4) (1,007.2) (164.4) (440.1) (674.3) (1,813.9) (749.1)
Net loss (199.3) (133.7) (233.8) (165.1) (470.2)       (301.9) (1,043.5) (173.3) (493.7) (731.9) (1,988.9) (777.3)
Net loss attributable to common stockholders $ (203.7) $ (135.5) $ (235.5) $ (165.1) $ (469.4)       $ (304.7) $ (1,045.3) $ (176.6) (501.6) $ (739.8) $ (1,996.0) $ (787.0)
Basic and diluted EPS — continuing operations(1) $ (10.42) [1] $ (5.32) [1] $ (12.71) [1] $ (8.85) [1] $ (27.28) [2]       $ (8.08) [2] $ (55.59) [2] $ (9.31) [2]   $ (37.30) $ (100.34) $ (42.52)
Diluted EPS — continuing operations(1)                         $ (37.30) $ (100.34) $ (42.52)
Weighted average shares used in calculating basic and diluted EPS 18.3 18.3 18.3 18.3 18.2       18.2 18.2 18.0   18.3 18.1 17.9
Weighted average shares used in calculating diluted EPS                         18.3 18.1 17.9
Summary Quarterly Financial Information (Textuals) [Abstract]                              
Asset impairment $ 230.7     $ 17.2 $ 377.0   $ 900.8         230.7 $ 247.9 $ 1,277.8 $ 154.4
Gain (Loss) on Disposition of Assets     $ 13.7                 (21.4) 23.2 45.0 41.4
Gain (loss) on sale of nonstrategic asset     6.2                        
Income (Loss) from Equity Method Investments 28.8                     (26.2) 16.2 (15.9) (107.6)
Interest Expense       $ 126.2               150.4 298.6 465.4 426.6
Reorganization Items 33.9 $ 29.7 95.4                 159.0 159.0 0.0 0.0
Restructuring and pension settlement charges             21.2           15.5 23.5 26.0
Loss on early debt extinguishment 29.5           (8.3) $ (59.5)       29.5 (29.5) (67.8) (1.6)
Loss from discontinued operations, net of income taxes $ 13.1 $ 38.1       $ 155.1   7.6       (53.6) (57.6) (175.0) (28.2)
Additional charge recorded as a result of the damages awarded to Eagle in arbitration                         (15.6)    
Remeasurement of foreign taxes         (0.5) $ 0.8   $ 0.2         0.4 0.5 2.7
Income tax benefit related to asset impairment         7.9   67.4         $ (6.2) (84.0) (176.4) 201.2
Change in fair value of credit support provided to Patriot             $ 34.7                
Australia Deferred Tax Assets [Member]                              
Summary Quarterly Financial Information (Textuals) [Abstract]                              
Valuation Allowance, Deferred Tax Asset, Increase, Amount                         (91.0)    
Australian Mining [Member]                              
Summary Quarterly Financial Information (Textuals) [Abstract]                              
Asset impairment                           675.2 66.7
US Deferred Tax Assets [Member]                              
Summary Quarterly Financial Information (Textuals) [Abstract]                              
Valuation Allowance, Deferred Tax Asset, Increase, Amount         $ 177.0               (2,342.9)    
Interest In Middlemount Coal Pty Limited [Member]                              
Summary Quarterly Financial Information (Textuals) [Abstract]                              
Income (Loss) from Equity Method Investments                         22.6 $ (7.0) $ (98.5)
Priairie State Campus [Member]                              
Summary Quarterly Financial Information (Textuals) [Abstract]                              
Gain (loss) on sale of nonstrategic asset                         6.2    
Nonstrategic Australian mining tenement [Member]                              
Summary Quarterly Financial Information (Textuals) [Abstract]                              
Gain (loss) on sale of nonstrategic asset     $ 2.8                   $ 0.0    
[1] EPS for the quarters may not sum to the amounts for the year as each period is computed on a discrete basis.
[2] EPS for the quarters may not sum to the amounts for the year as each period is computed on a discrete basis