SEGMENT REPORTING - Summary (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Leases and related maintenance and rental revenues		$ 3,704,045	$ 3,784,744	$ 3,512,867
Revenues		8,420,091	8,925,801	8,413,946
Earnings before tax, before reconciling items		48,624	105,203	467,943
Non-operating pension costs		(11,167)	(60,406)	(7,541)
Other items impacting comparability, net		(110,615)	(56,568)	(21,852)
Earnings (loss) from continuing operations before income taxes		(130,360)	(42,271)	389,469
Special recognition and retention bonus for front-line employees	$ 28,000
Eliminations
Revenue:
Revenues		(524,170)	(614,356)	(576,204)
Earnings before tax, before reconciling items		(42,801)	(50,732)	(63,593)
Segment Reconciling Items
Revenue:
Unallocated Central Support Services		(77,438)	(49,114)	(49,081)
Non-operating pension costs		(11,167)	(60,406)	(7,541)
Other items impacting comparability, net		(90,379)	(37,954)	(21,852)
FMS \| Operating Segments
Revenue:
Revenues		5,170,467	5,571,403	5,258,693
Earnings before tax, before reconciling items		(141,957)	(70,274)	340,038
FMS \| Operating Segments \| ChoiceLease
Revenue:
Leases and related maintenance and rental revenues		3,159,909	3,077,051	2,832,046
FMS \| Operating Segments \| SelectCare
Revenue:
Leases and related maintenance and rental revenues		514,310	541,358	502,835
FMS \| Operating Segments \| Commercial rental
Revenue:
Leases and related maintenance and rental revenues		834,232	1,009,086	960,606
FMS \| Operating Segments \| Other
Revenue:
Leases and related maintenance and rental revenues		69,125	92,286	87,331
FMS \| Operating Segments \| Fuel services revenue
Revenue:
Revenue from contract with customer		569,074	816,362	847,655
FMS \| Operating Segments \| ChoiceLease liability insurance revenue
Revenue:
Revenues		23,817	35,260	28,220
SCS
Revenue:
Revenues		2,544,420	2,551,271	2,398,144
SCS \| Operating Segments
Revenue:
Revenues		2,544,420	2,551,271	2,398,144
Earnings before tax, before reconciling items		73,442	81,149	61,236
DTS \| Operating Segments
Revenue:
Revenues		1,229,374	1,417,483	1,333,313
Earnings before tax, before reconciling items		$ 159,940	$ 145,060	$ 130,262

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