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Pension and Other Post-Retirement Plans - Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2015
USD ($)
U.K. Plan  
Expected benefit payments  
2016 $ 1.3
2017 1.4
2018 1.4
2019 1.6
2020 1.9
2021-2025 12.3
Canadian Plan  
Expected benefit payments  
2016 1.2
2017 1.3
2018 1.5
2019 1.6
2020 1.8
2021-2025 $ 12.0