Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Lease revenue	$ 1,098.1	$ 1,127.1	$ 1,130.1
Marine operating revenue	193.4	199.3	235.0
Other revenue	85.4	91.9	84.8
Total Revenues	1,376.9	1,418.3	1,449.9
Expenses
Maintenance expense	328.3	332.3	326.1
Marine operating expense	131.0	129.5	155.9
Depreciation	307.3	297.2	290.5
Operating lease expense	62.5	73.5	87.2
Other operating expense	34.4	43.8	38.4
Selling, general and administrative	181.5	174.7	192.4
Total Expenses	1,045.0	1,051.0	1,090.5
Other Income (Expense)
Net gain on asset dispositions	54.1	98.0	79.2
Interest expense, net	(160.5)	(148.1)	(155.1)
Other (expense) income	(11.1)	(11.8)	(13.2)
Income before Income Taxes and Share of Affiliates’ Earnings	214.4	305.4	270.3
Income Taxes	243.7	(95.7)	(110.9)
Share of Affiliates’ Earnings (net of tax)	43.9	47.4	45.9
Net Income	502.0	257.1	205.3
Other Comprehensive Income, net of taxes
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	93.2	(26.0)	(55.8)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	0.0	0.3	(0.6)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	4.8	0.6	(1.8)
Post-retirement benefit plans	3.5	12.8	7.8
Other comprehensive income (loss)	101.5	(12.3)	(50.4)
Comprehensive Income	$ 603.5	$ 244.8	$ 154.9
Share Data
Basic earnings per share (in dollars per share)	$ 12.95	$ 6.35	$ 4.76
Average number of common shares (in shares)	38.8	40.5	43.1
Diluted earnings per share (in dollars per share)	$ 12.75	$ 6.29	$ 4.69
Average number of common shares and common share equivalents (in shares)	39.4	40.9	43.8
Dividends declared per common share (in dollars per share)	$ 1.68	$ 1.60	$ 1.52