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Employee Benefit Plans - Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Expected benefit payments  
Expected benefit payments, years 2022-2026 $ 24.0
Minimum  
Expected benefit payments  
Expected benefit payments, year one 2.3
Expected benefit payments, year two 2.3
Expected benefit payments, year three 2.3
Expected benefit payments, year four 2.3
Expected benefit payments, year five 2.3
Maximum  
Expected benefit payments  
Expected benefit payments, year one 3.6
Expected benefit payments, year two 3.6
Expected benefit payments, year three 3.6
Expected benefit payments, year four 3.6
Expected benefit payments, year five $ 3.6