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Debt and Credit Facilities - Lines of Credit (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Used lines of credit $ 85.2us-gaap_ShortTermBorrowings $ 130.4us-gaap_ShortTermBorrowings
Unused lines of credit 1,137.1us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity 1,101.7us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Total available lines of credit $ 1,222.3us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity $ 1,232.1us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity