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Commitments and Contingent Liabilities - Amounts Outstanding under Operating Leases (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Leases [Abstract]  
2017 $ 10.1
2018 15.6
2019 14.5
2020 13.7
2021 9.4
Later Years 80.8
Total $ 144.1