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Commitments, Contingent Liabilities and Other Matters (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Future minimum rental payments under operating leases with remaining non-cancelable term      
2018 $ 8.3    
2019 7.9    
2020 6.5    
2021 4.6    
2022 4.4    
Thereafter 6.6    
Total minimum payments 38.3    
Total operating lease expense $ 12.9 $ 13.2 $ 13.4