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Resource Management, Acquisitions and Other Commercial Events (Details) AUD in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2014 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016 AUD
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  | $ 2.8 | $ 15.5 | $ 23.5 | $ 26.0 |
Held for sale, at carrying value |  |  | $ 125.0 |  |  | 125.0 |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  | 142.2 | 144.4 | 70.4 | 203.7 |
Liabilities |  |  | 10,195.2 | $ 11,596.2 | $ 11,596.2 | 10,195.2 |  |
Gain (loss) on sale of nonstrategic asset |  | $ 6.2 |  |  |  |  |  |
Interest in unincorporated joint venture project |  |  |  | 50.00% | 50.00% |  |  |
Cash Collateral | AUD |  |  |  |  |  |  |  | AUD 50.0
Priairie State Campus [Member] |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  | $ 57.1 |  |  |
Gain (loss) on sale of nonstrategic asset |  |  |  |  | 6.2 |  |  |
NewMexico/Coloradominingtenement [Member] [Member] |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  |  | $ 358.0 |  |
Gain (Loss) on Contract Termination |  |  | $ 20.0 |  |  |  |  |
Nonstrategic Australian mining tenement [Member] |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable | $ 62.6 |  |  |  | 64.1 |  |  |
Gain (loss) on sale of nonstrategic asset |  | $ 2.8 |  |  | 0.0 |  |  |
Olivedownssouthminingtenement [Member] [Domain] |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of nonstrategic asset |  |  |  |  | $ 2.8 |  |  |
Nonstrategic Kentucky Coal Reserves And Surface Lands [Member] |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  |  |  | 29.6 |
Gain (loss) on sale of nonstrategic asset |  |  |  |  |  |  | $ 13.6 |
Prarie State Energy Campus [Member] |  |  |  |  |  |  |  |
OtherCommercialEvents [Line Items] |  |  |  |  |  |  |  |
Undivided Interest Percent Of New Electricity Generation Project |  |  |  | 5.06% | 5.06% |  |  |

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