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Commitments and Contingencies
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies
Commitments and Contingencies
(a) We purchase annuities from life insurance companies to fulfill obligations under claim settlements that provide for periodic future payments to claimants. As of December 31, 2012, we had purchased such annuities in the amount of $8.0 million for settlement of claims on a structured basis for which we are contingently liable. To our knowledge, none of the issuers of such annuities have defaulted in their obligations thereunder.
 
(b) We have various operating leases for office space and equipment. Such lease agreements, which expire at various times, are generally renewed or replaced by similar leases. Rental expense under these leases amounted to $13.1 million in 2012, $11.6 million in 2011, and $11.4 million in 2010. See Note 2(p) for information on our accounting policy regarding leases.
 
In addition, certain leases for rented premises and equipment are non-cancelable, and liability for payment will continue even though the space or equipment may no longer be in use. At December 31, 2012, the total future minimum rental commitments under non-cancelable leases were $45.3 million and such yearly amounts are as follows:
($ in millions)
 
 
2013
 
$
10.6

2014
 
8.5

2015
 
7.2

2016
 
4.8

2017
 
3.5

After 2017
 
10.7

Total minimum payment required
 
$
45.3


 
(c) At December 31, 2012, we have contractual obligations that expire at various dates through 2022 to invest up to an additional $56.9 million in alternative and other investments. There is no certainty that any such additional investment will be required. For additional information regarding these investments, see item (f) of Note 5. "Investments."