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Guarantees (Details 3)
Mar. 31, 2016
USD ($)
Guarantor Obligations [Line Items]  
Guarantor obligations, maximum exposure, undiscounted $ 126,000,000
Fixed maximum amounts guaranteed by year 2016 27,400,000
Fixed maximum amounts guaranteed by year 2017 34,100,000
Fixed maximum amounts guaranteed by year 2018 6,100,000
Fixed maximum amounts guaranteed by year 2019 54,400,000
No scheduled maturity date 4,000,000
Amount outstanding under guarantees that is reflected on balance sheet 0
Letters of credit 56,100,000
Letters of credit set to expire - 2016 27,900,000
Letters of credit set to expire - 2017 28,200,000
Outstanding letters of credit 500,000
Amount of surety bonds outstanding $ 827,100,000