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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Total assets of variable interest entities | $ 216.4 | $ 197.5
Total liabilities of variable interest entities | $ 55.8 | $ 50.8

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