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Financial Instruments and Other Guarantees Textuals (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended	12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Apr. 01, 2017	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 03, 2017
Guarantee Obligations [Line Items]
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities					$ 1,136.8	$ 374.3
U.S. Mining
Guarantee Obligations [Line Items]
Asset retirement obligations					457.9
Reclamation Bonding Surety Bond | U.S. Mining | Surety Bond
Guarantee Obligations [Line Items]
Long-term debt					1,075.2
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020
Guarantee Obligations [Line Items]
Cash collateral required					0.0
Successor
Guarantee Obligations [Line Items]
Asset retirement obligations			$ 664.2		691.1
Cash collateral in support of reclamation obligations or activities					205.2
Interest expense	$ 42.5	$ 41.4			119.7
Successor | Obligations [Member]
Guarantee Obligations [Line Items]
Restricted cash collateral					323.1
Successor | U.S. Mining
Guarantee Obligations [Line Items]
Letters of credit outstanding, amount					174.0
Successor | Australian Mining
Guarantee Obligations [Line Items]
Asset retirement obligations					233.2
Cash collateral in support of reclamation obligations or activities					205.2
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities					61.6
Letters of credit outstanding, amount					14.5
Successor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020
Guarantee Obligations [Line Items]
Long-term debt					0.0
Exit facility, maximum borrowing capacity								$ 250.0
Letters of credit outstanding, amount					169.5
Interest expense					5.3
Successor | Obligations [Member]
Guarantee Obligations [Line Items]
Restricted cash collateral					$ 40.1
Predecessor
Guarantee Obligations [Line Items]
Asset retirement obligations			664.2			758.8	$ 712.1
Cash collateral in support of reclamation obligations or activities						233.2
Interest expense			32.9	$ 126.2		298.6	465.4
Predecessor | Obligations [Member]
Guarantee Obligations [Line Items]
Restricted cash collateral						529.3
Predecessor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020
Guarantee Obligations [Line Items]
Interest expense			$ 2.0			8.2	$ 1.8
Predecessor | Secured Debt | Former Securitization Facility
Guarantee Obligations [Line Items]
Cash collateral required						40.5
Predecessor | Obligations [Member]
Guarantee Obligations [Line Items]
Restricted cash collateral						$ 13.8

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