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Description of Business (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 09, 2017
Dec. 31, 2017
segment
shares
Jan. 11, 2018
USD ($)
$ / shares
Subsequent Event [Line Items]      
Number of new operating segments | segment   2  
Number of operating segments | segment   3  
Treasury shares, stock split | shares   16.5  
Subsequent Event      
Subsequent Event [Line Items]      
Cash consideration per share | $ / shares     $ 84.00
Enterprise value | $     $ 5,400.0
Business Combination, Termination Fee | $     $ 165.0
Common Stock      
Subsequent Event [Line Items]      
Stock split, conversion ratio 2