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Derivatives and Hedging Activities - Offsetting Assets (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross position | $ 7.9 | $ 4.1
Other Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross position | 7.9 | 4.1
Impact of master netting agreements | (0.4) | (0.4)
Net amounts recognized on the Condensed Consolidated Balance Sheet | $ 7.5 | $ 3.7

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