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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Supplemental Schedule of Noncash Investing and Financing Activities |  |
Cash dividends declared, but not yet paid | $ 4.0 | $ 4.1
Beneficial interest obtained in exchange for accounts receivable sold | $ 121.3 | $ 74.0

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