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Asset Impairment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Asset Impairment          
Asset impairment of long-lived assets       $ 717.4  
Asset realization risk $ 577.7   $ 577.7    
Equity Method Investment, Other than Temporary Impairment       183.4  
Total asset impairment 0.0 $ 0.0 17.2 900.8  
Asset impairment $ 0.0 0.0 17.2 900.8  
Australian Metallurgical Mining [Member]          
Asset Impairment          
Asset impairment of long-lived assets       527.0  
Impairment of Long-Lived Assets Held-for-use   230.5      
Equity Method Investment, Other than Temporary Impairment       0.0  
Total asset impairment       527.0  
Asset impairment     $ 17.2    
Australianheldforsale [Member]          
Asset Impairment          
Impairment of Long-Lived Assets to be Disposed of   304.7      
Australian Thermal Mining [Member]          
Asset Impairment          
Asset impairment of long-lived assets       8.2  
Equity Method Investment, Other than Temporary Impairment       0.0  
Total asset impairment       8.2  
Corporate and Other [Member]          
Asset Impairment          
Asset impairment of long-lived assets       182.2  
Impairment of Long-Lived Assets to be Disposed of   182.2      
Equity Method Investment, Other than Temporary Impairment       183.4  
Total asset impairment       $ 365.6  
Investments [Member]          
Asset Impairment          
Equity Method Investment, Other than Temporary Impairment   46.6      
Loans [Member]          
Asset Impairment          
Equity Method Investment, Other than Temporary Impairment   $ 136.8      
Scenario, Forecast [Member] | Metropolitan mine [Member]          
Asset Impairment          
Asset impairment         $ 180.0