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Pension Plans and Other Postretirement Benefits Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended
Mar. 01, 2016
Jul. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan contributions made   $ 115.0  
Other Postretirement Benefit Plan, Defined Benefit      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate used 4.05%   4.50%
Remeasurement decrease in plan liabilities $ 22.5    
Remeausrement decrease in benefit expense for remainder of 2016 $ 7.5