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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Supplemental Schedule of Noncash Investing and Financing Activities        
Cash dividends declared, but not yet paid $ 4.1   $ 4.1  
Beneficial interest obtained in exchange for accounts receivable sold $ 109.3 $ 82.1 $ 353.0 $ 239.2