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Employee Benefit Plans (Pensions Plans with Benefit Obligation in Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Pension plans with a benefit obligation in excess of plan assets:    
Projected benefit obligation $ 404.5 $ 446.5
Accumulated benefit obligation 398.4 439.6
Fair value of plan assets $ 281.8 $ 315.0