Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Lease revenue	$ 1,087.5	$ 1,088.5	$ 1,083.7
MarineOperatingRevenue	15.6	8.2	14.3
Other revenue	106.1	105.4	77.1
Total Revenues	1,209.2	1,202.1	1,175.1
Expenses
Maintenance expense	315.5	314.4	299.2
Marine operating expense	19.7	18.9	16.8
Depreciation	330.5	321.3	311.3
Operating lease expense	49.3	54.4	49.6
Other operating expense	35.3	31.3	33.1
Selling, general and administrative	172.0	180.4	182.5
Total Expenses	922.3	920.7	892.5
Other Income (Expense)
Net gain on asset dispositions	41.7	51.6	72.7
Interest expense, net	(190.3)	(180.5)	(162.9)
Other (expense) income	(13.0)	(7.3)	(21.7)
Income before Income Taxes and Share of Affiliates’ Earnings	125.3	145.2	170.7
Income Taxes	(37.3)	(40.9)	(30.5)
Share of Affiliates’ Earnings (net of tax)	62.2	76.5	50.3
Income from continuing operations	150.2	180.8	190.5
Net Income	151.3	211.2	211.3
Total Discontinued Operations, Net of Taxes	1.1	30.4	20.8
Other Comprehensive Income, net of taxes
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	24.4	(10.1)	(47.5)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(4.5)	3.9	4.5
Post-retirement benefit plans	6.2	7.2	7.4
Other comprehensive income (loss)		1.0	(35.6)
Comprehensive Income	$ 177.4	$ 212.2	$ 175.7
Income (Loss) from Continuing Operations, Per Basic Share	$ 4.30	$ 5.07	$ 5.07
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic Share	0.03	0.85	0.55
Share Data
Basic earnings per share (in dollars per share)	$ 4.33	$ 5.92	$ 5.62
Average number of common shares (in shares)	35.0	35.7	37.6
Income (Loss) from Continuing Operations, Per Diluted Share	$ 4.24	$ 4.97	$ 4.98
Diluted earnings per share (in dollars per share)	4.27	5.81	5.52
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Diluted Share	$ 0.03	$ 0.84	$ 0.54
Average number of common shares and common share equivalents (in shares)	35.4	36.4	38.3