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Employee Benefit Plans and Other Postretirement Plans - Schedule of Estimated Benefit Payments (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]  
2016 $ 37.8
2017 40.9
2018 44.8
2019 48.6
2020 52.4
2021 - 2025 312.7
Postretirement Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]  
2016 1.1
2017 1.1
2018 1.3
2019 1.3
2020 1.5
2021 - 2025 $ 7.9