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Retirement Plans (Expected Benefit Payments) (Details)
$ in Millions
Sep. 30, 2016
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Estimated benefit payments, CY plus 1 $ 32.6
Estimated benefit payments, CY plus 2 25.7
Estimated benefit payments, CY plus 3 25.6
Estimated benefit payments, CY plus 4 25.5
Estimated benefit payments, CY plus 5 25.4
Estimated benefit payments, CY plus 6 and up $ 122.9