Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Lease revenue	$ 274.4	$ 273.2
Revenue Recognition, Cargo and Freight, Policy [Policy Text Block]	13.1	14.2
Other revenue	29.5	17.9
Total Revenues	317.0	305.3
Expenses
Maintenance expense	81.2	81.2
Marine operating expense	12.1	12.5
Depreciation	79.9	77.4
Operating lease expense	13.7	13.0
Other operating expense	8.0	8.6
Selling, general and administrative	46.1	44.9
Total Expenses	241.0	237.6
Other Income (Expense)
Net gain on asset dispositions	8.9	56.1
Interest expense, net	(46.5)	(39.9)
Other (expense) income	(3.2)	(1.3)
Income before Income Taxes and Share of Affiliates’ Earnings	35.2	82.6
Income Taxes	(8.4)	(20.6)
Share of Affiliates’ Earnings (net of tax)	14.7	14.3
Net Income	41.5	76.3
Other Comprehensive Income, net of taxes
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(10.5)	14.9
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	2.0	(1.5)
Post-retirement benefit plans	3.0	1.9
Stockholders' Equity Attributable to Parent	1,809.2	1,839.7
Other comprehensive income (loss)	(5.5)	15.3
Comprehensive Income	$ 36.0	$ 91.6
Share Data
Basic earnings per share (in dollars per share)	$ 1.14	$ 2.02
Average number of common shares (in shares)	36.5	37.9
Diluted earnings per share (in dollars per share)	$ 1.12	$ 1.98
Average number of common shares and common share equivalents (in shares)	37.1	38.5