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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Total assets of variable interest entities | $ 264.0 | $ 264.1
Total liabilities of variable interest entities | $ 52.3 | $ 52.5

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