Financial Instruments (Fuel Hedges) (Details) - Fuel hedges - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative asset	$ 0	$ 3,000,000.0
Derivative liability	0
Total (loss) gain recognized in other comprehensive income (the effective portion)	(1,800,000)	3,400,000	$ 20,700,000
Other Income
Derivative [Line Items]
Amounts recognized in other income, net for ineffectiveness	$ 0	$ 100,000	$ 800,000

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of gain (loss) from the ineffectiveness of the hedge.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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