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Investments (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Windfield Holdings |  |
Schedule of Investments [Line Items] |  |
Equity method investment, ownership percentage | 49.00% |
Carrying value of unconsolidated investment | $ 376.5 | $ 349.6
Other variable interest entities |  |
Schedule of Investments [Line Items] |  |
Carrying value of unconsolidated investment | $ 7.7 | $ 8.1

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