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Loss and Loss Adjustment Expense Including Amounts for Risks Relating to Asbestos Related Illnesses and Environmental Impairment (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Commitments and Contingencies [Line Items]
Gross reserves	$ 541.6	$ 525.9
Net reserves	418.1	408.0
TransRe
Commitments and Contingencies [Line Items]
Gross reserves	528.2	512.4
Net reserves	404.8	394.5
CATA
Commitments and Contingencies [Line Items]
Gross reserves	13.4	13.5
Net reserves	$ 13.3	$ 13.5

Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers.

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- Definition

Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, net of estimated reinsurance recoveries.

+ References+ Details