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Commitments and Contingent Liabilities - Amounts Outstanding under Operating Leases (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Leases [Abstract]  
2018 $ 6.6
2019 16.0
2020 15.4
2021 10.9
2022 8.9
Later Years 74.6
Total $ 132.4