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Debt And Credit Arrangements - Letters of Credit (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument    
Restricted cash $ 6.5 $ 8.7
Restricted cash, current 5.5 7.7
Restricted cash, noncurrent 1.0 1.0
Energy & Chemicals    
Debt Instrument    
Restricted cash 6.4 6.4
Restricted cash, current 5.4 $ 5.4
Restricted cash, noncurrent $ 1.0