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Pension and Post-retirement and Other Benefit Plans - Key Information for Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]    
Aggregate projected benefit obligation $ 316.3 $ 350.6
Aggregate accumulated benefit obligation 307.7 343.1
Aggregate fair value of plan assets $ 227.3 $ 260.7