RECENT ACCOUNTING PRONOUNCEMENTS Lease Standard - Effect on Statement of Consolidated Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		$ 858,600		$ 1,683,600
Total revenue	$ 2,244,993	2,089,904	$ 4,425,320	3,994,109
Other operating expenses	29,663	30,687	63,289	63,662
Selling, general and administrative expenses	226,416	212,612	457,741	420,440
Used vehicle sales, net	18,140	5,559	26,357	12,990
Interest expense	60,759	42,751	116,095	80,911
Restructuring and other items, net	9,836	2,774	16,014	17,895
Earnings from continuing operations before income taxes	103,069	101,894	171,220	154,593
Provision for income taxes	27,617	55,725	49,878	71,111
Earnings from continuing operations	75,452	46,169	121,342	83,482
Net earnings	75,215	44,908	120,531	81,794
Comprehensive income	$ 66,245	$ 9,157	$ 132,777	$ 63,414
Earnings per common share - Basic
Continuing operations (in dollars per share)	$ 1.44	$ 0.88	$ 2.31	$ 1.59
Net earnings (in dollars per share)	1.43	0.85	2.29	1.56
Earnings per common share - Diluted
Continuing operations (in dollars per share)	1.43	0.87	2.30	1.58
Net earnings (in dollars per share)	$ 1.43	$ 0.85	$ 2.28	$ 1.55
Accounting Standards Update 2016-02 | As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		$ 858,000		$ 1,682,300
Total revenue		2,089,300		3,992,800
Other operating expenses		30,900		64,400
Selling, general and administrative expenses		212,900		421,800
Used vehicle sales, net		6,000		13,400
Interest expense		42,400		80,200
Restructuring and other items, net		3,600		19,400
Earnings from continuing operations before income taxes		98,300		146,400
Provision for income taxes		54,800		68,900
Earnings from continuing operations		43,500		77,500
Net earnings		42,300		75,800
Comprehensive income		$ 4,900		$ 55,900
Earnings per common share - Basic
Continuing operations (in dollars per share)		$ 0.83		$ 1.47
Net earnings (in dollars per share)		0.80		1.44
Earnings per common share - Diluted
Continuing operations (in dollars per share)		0.82		1.46
Net earnings (in dollars per share)		$ 0.80		$ 1.43
Accounting Standards Update 2016-02 | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Used vehicle sales, net				$ (400)
Earnings from continuing operations				6,000
Net earnings				6,000
Service
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold	$ 976,405	$ 908,079	$ 1,948,095	1,696,850
Service | Accounting Standards Update 2016-02 | As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		906,000		1,693,300
Lease, Related Maintenance and Rental
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold	$ 687,540	632,779	$ 1,351,829	1,248,384
Lease, Related Maintenance and Rental | Accounting Standards Update 2016-02 | As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		636,400		1,255,600
Lessor Adjustments | Accounting Standards Update 2016-02 | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		300		700
Total revenue		300		700
Other operating expenses		0		0
Selling, general and administrative expenses		800		100
Used vehicle sales, net		(500)		(400)
Interest expense		0		0
Restructuring and other items, net		(200)		0
Earnings from continuing operations before income taxes		3,800		8,300
Provision for income taxes		1,000		2,200
Earnings from continuing operations		2,800		6,100
Net earnings		2,800		6,100
Comprehensive income		$ 4,300		$ 7,600
Earnings per common share - Basic
Continuing operations (in dollars per share)		$ 0.05		$ 0.12
Net earnings (in dollars per share)		0.05		0.12
Earnings per common share - Diluted
Continuing operations (in dollars per share)		0.05		0.12
Net earnings (in dollars per share)		$ 0.05		$ 0.12
Lessor Adjustments | Service | Accounting Standards Update 2016-02 | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		$ 0		$ 0
Lessor Adjustments | Lease, Related Maintenance and Rental | Accounting Standards Update 2016-02 | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		(3,600)		(7,200)
Lessee and Other Adjustments | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		300		600
Total revenue		300		600
Other operating expenses		(300)		(800)
Selling, general and administrative expenses		(1,100)		(1,400)
Used vehicle sales, net		0		0
Interest expense		400		800
Restructuring and other items, net		(600)		(1,500)
Earnings from continuing operations before income taxes		(200)		(100)
Provision for income taxes		0		0
Earnings from continuing operations		(200)		(100)
Net earnings		(200)		(100)
Comprehensive income		$ 0		$ 0
Earnings per common share - Basic
Continuing operations (in dollars per share)		$ 0		$ 0
Net earnings (in dollars per share)		0		0
Earnings per common share - Diluted
Continuing operations (in dollars per share)		0		0
Net earnings (in dollars per share)		$ 0		$ 0
Lessee and Other Adjustments | Service | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		$ 2,000		$ 3,600
Lessee and Other Adjustments | Lease, Related Maintenance and Rental | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		0		0
Prior Period Error | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		(4,400)		(9,100)
Prior Period Error | Lease, Related Maintenance and Rental | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		$ (4,400)		$ (9,100)