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Guarantees (Details 5)
Dec. 31, 2015
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Guarantor obligations, maximum exposure, undiscounted $ 128,600,000
Fixed maximum amounts guaranteed by year 2016 33,100,000
Fixed maximum amounts guaranteed by year 2017 35,000,000
Fixed maximum amounts guaranteed by year 2018 600,000
Fixed maximum amounts guaranteed by year 2019 54,900,000
Expires on a specified number of days after the receipt of written notice 1,000,000
Fixed maximum amounts guaranteed by year no maturity date 4,000,000
Amount outstanding under guarantees 0
Letters of credit 57,300,000
Outstanding letters of credit 4,100,000
Amount of surety bonds outstanding $ 530,000,000