Leases - Charters-out (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Future Minimum Payments Receivable:
Minimum scheduled future revenues	$ 3,400.0
Revenues receivable - 2019	743.6
Revenues receivable - 2020	645.2
Revenues receivable - 2021	560.0
Revenues receivable - 2022	526.9
Revenues receivable - 2023	275.1
Revenues receivable - Thereafter	698.1
Property Available for Operating Lease
Schedule Of Operating Leases [Line Items]
Operating leases cost	4,300.0	$ 4,400.0
Operating leases accumulated depreciation	1,100.0	1,000.0
Operating leases carrying amount of the vessels	3,200.0	$ 3,400.0
Future Minimum Payments Receivable:
Minimum scheduled future revenues	3,500.0
Revenues receivable - 2019	763.0
Revenues receivable - 2020	661.6
Revenues receivable - 2021	576.4
Revenues receivable - 2022	537.4
Revenues receivable - 2023	277.4
Revenues receivable - Thereafter	$ 727.9

Schedule Of Operating Leases [Line Items]

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the third year from the balance sheet date under an operating lease.

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Future rental payments receivable within the second year from the balance sheet date under an operating lease.

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Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount before accumulated depreciation of physical assets used in the normal conduct of business to produce goods and services subject to or available for lease.

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The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

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