Investments - OpNet - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022	Jun. 26, 2023	Nov. 30, 2022
Schedule of Equity Method Investments [Line Items]
Total equity method pickup earnings (losses) recognized in Other revenues in our Consolidated Statements of Earnings	$ (87.8)	$ 16.1	$ (151.8)	$ 49.8
Ownership percentage upon conversion	71.80%		71.80%
OpNet
Schedule of Equity Method Investments [Line Items]
Ownership percentage	47.40%		47.40%
Investment voting percentage	50.00%		50.00%
Total equity method pickup earnings (losses) recognized in Other revenues in our Consolidated Statements of Earnings	$ (83.0)	$ (14.5)	$ (121.8)	$ (29.3)
Subscriptions advance amount	23.4		82.9
Common stock warrants, at fair value	85.2		85.2			$ 54.2
Subordinated bonds at fair value	52.7		52.7			48.6
Principal outstanding	46.3		46.3			19.3
OpNet | Subsequent event
Schedule of Equity Method Investments [Line Items]
Additional loan to investee					$ 15.6
OpNet | Redeemable Preferred Stock
Schedule of Equity Method Investments [Line Items]
Preferred stock, redemption amount	0.0		0.0			24.5
OpNet | Convertible Preferred Stock
Schedule of Equity Method Investments [Line Items]
Preferred stock, redemption amount	$ 0.4		$ 0.4			$ 0.0