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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]      
Beneficial interest obtained in exchange for accounts receivable sold $ 353.9 $ 343.3 $ 162.6
Cash dividends declared, but not yet paid $ 4.0 $ 4.0 $ 4.1