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Pension Benefits - Pension Benefit Payments (Details) - Pension Plans, Defined Benefit [Member]
$ in Millions
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Expected Future Benefit Payments In 2017 $ 27.6
Expected Future Benefit Payments in 2018 28.8
Expected Future Benefit Payments in 2019 29.9
Expected Future Benefit Payments in 2020 30.9
Expected Future Benefit Payments in 2021 31.9
Expected Future Benefit Payments in 2022-2026 $ 170.0