The ratio of the reinsurance premiums ceded, plus net ceded reinsurance balances from non-US affiliates for paid losses, unpaid losses, incurred but not reported (IBNR), unearned premiums and commissions, less funds held from reinsurers, plus ceded reinsurance balances payable, to policyholders' surplus. This ratio measures the company's dependence upon the security provided by its reinsurers and its potential exposure to adjustment on such reinsurance.