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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Cash Flows [Abstract]      
Cash consideration, exclusive of cash transferred   $ 30.2  
Income tax refunds $ 2.7 $ 4.3 $ 8.8