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Pension Benefits - Pension Benefit Payments (Details) - Pension Plans, Defined Benefit [Member]
$ in Millions
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Expected Future Benefit Payments In 2016 $ 26.3
Expected Future Benefit Payments in 2017 27.7
Expected Future Benefit Payments in 2018 29.1
Expected Future Benefit Payments in 2019 30.3
Expected Future Benefit Payments in 2020 31.5
Expected Future Benefit Payments in 2021-2025 $ 174.4