Pension and Post-retirement and Other Benefit Plans - Weighted-average Assumptions Used to Determine Benefit Obligations (Details)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pensions
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.40%	4.00%	4.92%
Rate of compensation increase	3.19%	3.23%	3.45%
Other post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%	4.25%	5.10%