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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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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.

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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.

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