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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 |

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