Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Feb. 29, 2020	Feb. 28, 2019
Segment Reporting Information [Line Items]
Revenues	$ 1,080.8	$ 1,046.4
Adjusted EBITDA	431.6	408.1
Interest income	0.4	0.4
Interest expense	(61.2)	(66.9)
(Provision) benefit for income taxes	(4.3)	0.9
Amortization related to acquired intangible assets	(94.2)	(95.7)
Stock-based compensation expense	(82.6)	(59.7)
Restructuring charges	(4.5)	(8.2)
Net income attributable to IHS Markit Ltd.	485.0	109.7
Financial Services Segment
Segment Reporting Information [Line Items]
Revenues	436.0	409.2
Adjusted EBITDA	205.4	183.2
Transportation Segment
Segment Reporting Information [Line Items]
Revenues	297.2	288.1
Adjusted EBITDA	118.0	114.3
Resources Segment
Segment Reporting Information [Line Items]
Revenues	225.6	216.8
Adjusted EBITDA	90.2	93.2
CMS Segment
Segment Reporting Information [Line Items]
Revenues	122.0	132.3
Adjusted EBITDA	29.4	29.4
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA	(11.4)	(12.0)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0.0	0.0
Interest income	0.4	0.4
Interest expense	(61.2)	(66.9)
(Provision) benefit for income taxes	(4.3)	0.9
Depreciation	(51.1)	(46.6)
Amortization related to acquired intangible assets	(94.2)	(95.7)
Stock-based compensation expense	(82.6)	(59.7)
Restructuring charges	(4.5)	(8.2)
Acquisition-related costs	(0.7)	(7.5)
Acquisition-related performance compensation	(0.2)	(15.3)
Loss on debt extinguishment	0.0	0.2
Gain on sale of assets	372.3	0.0
Pension mark-to-market and settlement expense	(21.2)	0.0
Share of joint venture results not attributable to Adjusted EBITDA	(0.3)	(0.1)
Adjusted EBITDA attributable to noncontrolling interest	1.0	0.5
Net income attributable to IHS Markit Ltd.	$ 485.0	$ 109.7