Mezzanine Equity (Details) - USD ($)	1 Months Ended	3 Months Ended				6 Months Ended
	Mar. 31, 2013	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	May 31, 2019	May 31, 2020	May 31, 2019
Purchase Requirement [Line Items]
Redeemable noncontrolling interests		$ 22,300,000		$ 26,600,000		$ 22,300,000
Mandatorily redeemable convertible preferred shares redemption value		125,000,000		$ 125,000,000		$ 125,000,000
Dividends per common share (in dollars per share)			$ 0.15	$ 0.125		$ 0.15
Increase of preferred stock dividend		1,404,000			$ 1,276,000	$ 2,826,000	$ 2,552,000
Cumulative convertible preferred shares
Purchase Requirement [Line Items]
Dividend rate on preferred stock	3.25%					3.25%
Mandatorily redeemable convertible preferred shares redemption value		$ 125,000,000.0				$ 125,000,000.0
Mandatorily redeemable preferred stock, number of shares in conversion (in shares)		4,440,863				4,440,863
Mandatorily redeemable preferred stock, effective conversion price per share (in dollars per share)		$ 28.15				$ 28.15
Minimum dividend considered for additional quarterly payments (in dollars per share)		0.0625				$ 0.0625
Increase of preferred stock dividend						$ 2,800,000	$ 2,600,000
Preferred stock, effective dividend rate, percentage						4.50%
Mandatorily redeemable preferred shares callable price per share (in dollars per share)		$ 1,000				$ 1,000
Jefferies Group
Purchase Requirement [Line Items]
Dividend rate on preferred stock	3.25%