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Commitments and Contingent Liabilities - Amounts Outstanding under Operating Leases (Details)
$ in Millions
Jun. 30, 2017
USD ($)
Leases [Abstract]  
2017 $ 9.9
2018 15.7
2019 14.6
2020 13.8
2021 9.4
Later Years 80.8
Total $ 144.2