STATEMENTS OF COMPREHENSIVE INCOME AND RETAINED EARNINGS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018
Income Statement [Abstract]
Interest and fee Income	$ 81.0		$ 61.3
Operating lease and rental revenues	99.3		101.5
Used truck sales and other revenues	3.7		7.7
TOTAL INTEREST AND OTHER REVENUES	184.0		170.5
Interest and other borrowing costs	41.8		28.9
Depreciation and other rental expenses	83.3		93.2
Cost of used truck sales and other expenses	1.9		6.8
Selling, general and administrative expenses	15.3		13.8
Provision for losses on receivables	2.9		1.2
TOTAL EXPENSES	145.2		143.9
INCOME BEFORE INCOME TAXES	38.8		26.6
Income taxes	9.2		6.2
NET INCOME	29.6		20.4
COMPREHENSIVE INCOME	25.8		22.9
RETAINED EARNINGS AT BEGINNING OF PERIOD	1,488.2	[1]	1,396.1
RETAINED EARNINGS AT END OF PERIOD	$ 1,517.8		$ 1,416.5

[1] The December 31, 2018 balance sheet has been derived from audited financial statements.