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Retirement Plans (Expected Benefit Payments) (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Estimated benefit payments, CY plus 1 $ 32.1
Estimated benefit payments, CY plus 2 25.4
Estimated benefit payments, CY plus 3 25.4
Estimated benefit payments, CY plus 4 25.2
Estimated benefit payments, CY plus 5 25.0
Estimated benefit payments, CY plus 6 and up $ 120.1