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Leases - Textuals (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) leases | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) leases | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) leases | Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lease Obligation, Assumed Amount Recoverable from Third Parties | $ 0.0 |  | $ 0.0 |  | $ 0.0 |
Provision for North Goonyella equipment loss | $ 0.0 | $ 49.3 | $ 24.7 | $ 49.3 |  | $ 66.4
Number of Operating Leases with Contingent Rent Provisions | leases | 1 |  | 1 |  | 1 |
Operating Leases, Rent Expense |  | 36.3 |  | $ 122.6 |  |
Operating Leases, Rent Expense, Contingent Rentals | $ 0.0 |  | $ 0.0 |  |  |
Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating and Finance Leases Remaining Lease Term |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating and Finance Leases Remaining Lease Term |  |  | 11 years 7 months 6 days |  |  |
North Goonyella Mine |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Provision for North Goonyella equipment loss | $ 60.0 | $ 49.3 | $ 24.7 |  |  | $ 66.4
North Goonyella Mine | Leased Equipment |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Provision for North Goonyella equipment loss |  |  |  |  | $ 50.7 |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77895616&loc=d3e36728-112689 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=77910666&loc=d3e35050-112683 + Details
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