Consolidated Lease Liabilities And Right-Of-Use Lease Assets Related To Operating Leases (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Maturity of lease payments, by year
1 year or less	$ 38.4
More than 1 year to 2 years	35.4
More than 2 years to 3 years	30.0
More than 3 years to 4 years	26.8
More than 4 years to 5 years	24.9
More than 5 years	149.4
Total lease payments	304.9	[1]
Less: interest	(64.6)	[2]
Lease liabilities	240.3	[3]
Right-of-use lease assets	212.1	[4]
Prepaid lease assets, net of lease allowances and incentives	28.2
Right-of-use lease assets and prepaid lease assets, net of lease allowances and incentives	$ 240.3

[1] As of September 30, 2019, the weighted average lease term was approximately 12 years.

[2] As of September 30, 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.