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Commitments and Contingencies (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019
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Capital Addition Purchase Commitments |  |
Operating Leased Assets [Line Items] |  |
Amount remaining under long-term commitment obligation | $ 13.0 |
Amount prepaid under long-term commitment obligation | $ 0.9 |
LTG |  |
Operating Leased Assets [Line Items] |  |
Reserve relating to outstanding non-regulatory litigation claim |  | $ 5.0

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