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Supplemental Guarantor/Non-Guarantor Financial Information DND CF (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted cash for distributions to noncontrolling interests   $ 0.0 $ 0.0 $ (42.5)
Net cash provided by continuing operations $ 490.0 (22.9) 18.9 441.0
Net cash used in discontinued operations (29.2) (29.9) (33.3) (104.4)
Net Cash Provided by (Used in) Operating Activities 460.8 (52.8) (14.4) 336.6
Payments to Acquire Property, Plant, and Equipment (106.7) (126.6) (126.8) (194.4)
Changes in accrued expenses related to capital expenditures (2.1) (6.1) (9.2) (16.6)
Federal Coal Lease Expenditures (248.5)      
Proceeds from disposal of assets, net of notes receivable 142.2 144.4 70.4 203.7
Contributions to joint ventures (208.3) (309.5) (425.4) (529.8)
Distributions from joint ventures 215.4 312.4 422.6 534.2
Repayment of loans from related parties (39.8) 40.6 0.9 5.4
Increase (Decrease) in Due from Related Parties 39.3 40.4 3.7 33.7
Other, net (4.6) (9.9) (3.1) (5.0)
Net cash used in continuing operations (213.1) (244.1) (290.0) (314.5)
Proceeds from long-term debt 511.4 1,458.4 975.7 1.1
Repayments of long-term debt (506.6) (513.7) (671.3) (21.0)
Payment of deferred financing costs (28.2) (31.0) (28.7) (10.1)
Minority Interest, Increase from Contributions to Noncontrolling Interest Holders (4.0)      
Proceeds from (Payments for) Other Financing Activities (0.1) (5.8) (6.6) (3.3)
Transactions with affiliates, net 0.0 0.0 0.0 0.0
Net cash provided by (used in) financing activities (27.5) 907.9 267.7 (168.1)
Net change in cash and cash equivalents 220.2 611.0 (36.7) (146.0)
Cash and cash equivalents at end of year 872.3 872.3 261.3 298.0
Parent Company [Member]        
Restricted cash for distributions to noncontrolling interests       0.0
Net cash provided by continuing operations   (167.3) (692.9) (369.0)
Net cash used in discontinued operations   (16.2) (27.4) (73.3)
Net Cash Provided by (Used in) Operating Activities   (183.5) (720.3) (442.3)
Payments to Acquire Property, Plant, and Equipment   0.0 0.0 0.0
Changes in accrued expenses related to capital expenditures   0.0 0.0 0.0
Proceeds from disposal of assets, net of notes receivable   0.0 0.0 0.0
Contributions to joint ventures   0.0 0.0 0.0
Distributions from joint ventures   0.0 0.0 0.0
Repayment of loans from related parties   0.0 0.0 0.0
Increase (Decrease) in Due from Related Parties   0.0 0.0 0.0
Other, net   0.0 0.0 0.0
Proceeds from long-term debt   1,450.6 975.7 0.0
Repayments of long-term debt   (503.0) (662.0) (12.0)
Payment of deferred financing costs   (26.8) (28.7) (10.1)
Proceeds from (Payments for) Other Financing Activities   0.0 1.4 3.1
Transactions with affiliates, net   (477.9) 253.8 441.6
Net cash provided by (used in) financing activities   442.9 538.8 330.3
Net change in cash and cash equivalents   259.4 (181.5) (112.0)
Cash and cash equivalents at end of year 266.6 266.6 7.2 188.7
Guarantor Subsidiaries [Member]        
Restricted cash for distributions to noncontrolling interests       0.0
Net cash provided by continuing operations   78.5 615.3 764.7
Net cash used in discontinued operations   (1.9) (2.9) (4.6)
Net Cash Provided by (Used in) Operating Activities   76.6 612.4 760.1
Payments to Acquire Property, Plant, and Equipment   (55.5) (70.6) (95.8)
Changes in accrued expenses related to capital expenditures   (0.6) (2.3) 2.2
Proceeds from disposal of assets, net of notes receivable   77.7 36.3 105.9
Contributions to joint ventures   0.0 0.0 0.0
Distributions from joint ventures   0.0 0.0 0.0
Repayment of loans from related parties   0.0 0.0 0.0
Increase (Decrease) in Due from Related Parties   0.0 0.0 0.0
Other, net   (5.1) (2.7) (4.2)
Proceeds from long-term debt   0.0 0.0 0.0
Repayments of long-term debt   (4.4) (0.7) (0.7)
Payment of deferred financing costs   0.0 0.0 0.0
Proceeds from (Payments for) Other Financing Activities   (5.8) (1.8) (1.7)
Transactions with affiliates, net   268.4 (289.9) (488.2)
Net cash provided by (used in) financing activities   258.2 (292.4) (490.6)
Net change in cash and cash equivalents   102.3 3.5 0.9
Cash and cash equivalents at end of year 107.0 107.0 4.7 1.2
Non-Guarantor Subsidiaries [Member]        
Restricted cash for distributions to noncontrolling interests       42.5
Net cash provided by continuing operations   65.9 96.5 45.3
Net cash used in discontinued operations   (11.8) (3.0) (26.5)
Net Cash Provided by (Used in) Operating Activities   54.1 93.5 18.8
Payments to Acquire Property, Plant, and Equipment   (71.1) (56.2) (98.6)
Changes in accrued expenses related to capital expenditures   (5.5) (6.9) (18.8)
Proceeds from disposal of assets, net of notes receivable   66.7 34.1 97.8
Contributions to joint ventures   (309.5) (425.4) (529.8)
Distributions from joint ventures   312.4 422.6 534.2
Repayment of loans from related parties   40.6 0.9 5.4
Increase (Decrease) in Due from Related Parties   40.4 3.7 33.7
Other, net   (4.8) (0.4) (0.8)
Proceeds from long-term debt   7.8 0.0 1.1
Repayments of long-term debt   (6.3) (8.6) (8.3)
Payment of deferred financing costs   (4.2) 0.0 0.0
Proceeds from (Payments for) Other Financing Activities   0.0 (6.2) (4.7)
Transactions with affiliates, net   209.5 36.1 46.6
Net cash provided by (used in) financing activities   206.8 21.3 (7.8)
Net change in cash and cash equivalents   249.3 141.3 (34.9)
Cash and cash equivalents at end of year 498.7 498.7 $ 249.4 $ 108.1
Debtor Subsidiaries [Member]        
Net cash provided by continuing operations 435.8      
Net cash used in discontinued operations (18.3)      
Net Cash Provided by (Used in) Operating Activities 417.5      
Payments to Acquire Property, Plant, and Equipment (62.6)      
Changes in accrued expenses related to capital expenditures (0.9)      
Federal Coal Lease Expenditures (248.5)      
Proceeds from disposal of assets, net of notes receivable 75.6      
Contributions to joint ventures 0.0      
Distributions from joint ventures 0.0      
Repayment of loans from related parties 0.0      
Increase (Decrease) in Due from Related Parties 0.0      
Other, net (2.0)      
Net cash used in continuing operations (236.6)      
Proceeds from long-term debt 503.6      
Repayments of long-term debt (502.9)      
Payment of deferred financing costs (26.8)      
Minority Interest, Increase from Contributions to Noncontrolling Interest Holders 0.0      
Proceeds from (Payments for) Other Financing Activities (0.1)      
Transactions with affiliates, net 131.3      
Net cash provided by (used in) financing activities 105.1      
Net change in cash and cash equivalents 286.0      
Cash and cash equivalents at end of year 394.5 394.5    
Non-Debtor Subsidiaries [Member]        
Net cash provided by continuing operations 54.2      
Net cash used in discontinued operations (10.9)      
Net Cash Provided by (Used in) Operating Activities 43.3      
Payments to Acquire Property, Plant, and Equipment (44.1)      
Changes in accrued expenses related to capital expenditures (3.0)      
Federal Coal Lease Expenditures 0.0      
Proceeds from disposal of assets, net of notes receivable 66.6      
Contributions to joint ventures (208.3)      
Distributions from joint ventures 215.4      
Repayment of loans from related parties (39.8)      
Increase (Decrease) in Due from Related Parties 39.3      
Other, net (2.6)      
Net cash used in continuing operations 23.5      
Proceeds from long-term debt 7.8      
Repayments of long-term debt (3.7)      
Payment of deferred financing costs (1.4)      
Minority Interest, Increase from Contributions to Noncontrolling Interest Holders (4.0)      
Proceeds from (Payments for) Other Financing Activities 0.0      
Transactions with affiliates, net (131.3)      
Net cash provided by (used in) financing activities (132.6)      
Net change in cash and cash equivalents (65.8)      
Cash and cash equivalents at end of year $ 477.8 $ 477.8