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Debt and Credit Facilities - Lines of Credit (Parenthetical) (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Line Of Credit Facility [Line Items]    
Cash held on deposit as compensating balance $ 56.0 $ 36.2
Total available lines of credit 1,281.8 $ 1,252.1
Committed Line of Credit Facilities [Member]    
Line Of Credit Facility [Line Items]    
Total available lines of credit $ 892.0