Consolidated Lease Liabilities And Right-Of-Use Lease Assets Related To Operating Leases (Detail) $ in Millions	Dec. 31, 2019 USD ($)
Maturity of lease payments, by year
1 year or less	$ 39.0
More than 1 year to 2 years	36.5
More than 2 years to 3 years	28.9
More than 3 years to 4 years	27.2
More than 4 years to 5 years	24.8
More than 5 years	145.2
Total lease payments	301.6	[1]
Less: interest	(60.5)	[2]
Lease liabilities	241.1	[3]
Right-of-use lease assets	209.7	[4]
Prepaid lease assets, net of lease allowances and incentives	31.4
Right-of-use lease assets and prepaid lease assets, net of lease allowances and incentives	$ 241.1

[1] As of December 31, 2019, the weighted average lease term was approximately 12 years.

[2] As of December 31, 2019, the weighted average discount rate was approximately 5 percent.

[3] Represents the present value of lease liabilities and is reported as a component of other liabilities on Alleghany’s consolidated balance sheet.

[4] Reported as a component of other assets on Alleghany’s consolidated balance sheet.