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Debit and Credit Arrangement (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Total principal debt $ 851.9 $ 917.8
Unamortized fair value adjustment   (2.9)
Unamortized debt issuance cost (2.5) (3.0)
Effect of foreign exchange rate changes   (0.8)
Long-term debt 849.4 911.1
Senior Debentures (Unsecured) Maturing June 15, 2021
   
Debt Instrument [Line Items]    
Total principal debt 300.0 300.0
Senior Debentures (Unsecured) Maturing March 1, 2020
   
Debt Instrument [Line Items]    
Total principal debt 200.0 200.0
Senior Debentures (Unsecured) Maturing October 15, 2025
   
Debt Instrument [Line Items]    
Total principal debt 120.9 121.6
Junior debentures maturing February 3, 2027
   
Debt Instrument [Line Items]    
Total principal debt 59.7 59.7
Subordinated Note Maturing November 16, 2034
   
Debt Instrument [Line Items]    
Total principal debt   15.6
Subordinated Note Maturing September 21, 2036
   
Debt Instrument [Line Items]    
Total principal debt   50.0
Federal Home Loan Bank Borrowings
   
Debt Instrument [Line Items]    
Total principal debt 171.3 163.9
Capital Securities
   
Debt Instrument [Line Items]    
Total principal debt   $ 7.0