Consolidated Lease Liabilities And Right-Of-Use Lease Assets Related To Operating Leases (Detail) $ in Millions	Jun. 30, 2019 USD ($)
Maturity of lease payments, by year
1 year or less	$ 37.9
More than 1 year to 2 years	34.9
More than 2 years to 3 years	30.9
More than 3 years to 4 years	26.6
More than 4 years to 5 years	25.6
More than 5 years	155.3
Total lease payments	311.2	[1]
Less: interest	66.6	[2]
Lease liabilities	244.6	[3]
Right-of-use lease assets	216.2	[4]
Prepaid lease assets, net of lease allowances and incentives	28.4
Right-of-use lease assets and prepaid lease assets, net of lease allowances and incentives	$ 244.6

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

[2] As of June 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.