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Debt and Credit Facilities - Other Lines of Credit (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Line Of Credit [Line Items]    
Available lines of credit $ 1,039.7 $ 1,028.7
Unused lines of credit 962.7 989.5
Weighted average interest rate 6.20% 6.40%
Other Lines of Credit [Member]
   
Line Of Credit [Line Items]    
Available lines of credit 339.7 328.3
Unused lines of credit $ 262.7 $ 289.0
Weighted average interest rate 8.40% 10.20%