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PENSION AND POST-RETIREMENT PLANS - ESTIMATED BENEFIT PAYMENTS (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Estimated future benefit payments  
2017 $ 4.1
2018 4.1
2019 4.1
2020 4.1
2021 4.1
2022-2026 76.3
Total future payments 96.8
Pensions  
Estimated future benefit payments  
2017 12.4
2018 12.8
2019 13.1
2020 13.4
2021 13.7
2022-2026 73.0
Total future payments 138.4
Nonqualified Pensions Benefits  
Estimated future benefit payments  
2017 1.0
2018 1.1
2019 0.2
2020 0.5
2022-2026 2.7
Total future payments 5.5
Post Retirement  
Estimated future benefit payments  
2017 2.7
2018 2.8
2019 2.9
2020 3.0
2021 3.1
2022-2026 16.7
Total future payments $ 31.2