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Investments (Textuals) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Accounts receivable with affiliates $ 20.2   $ 20.2   $ 15.6
Accounts payable with affiliates 10.0   10.0   17.8
Investments (Textuals)          
Realized gains and proceeds from the sale of securities 0.0 $ 0.0 0.0 $ 0.0  
Cash surrender value of insurance contracts 8.3   8.3   79.8
Interest rate swap asset, carrying value and fair value $ 8.8   $ 8.8   $ 7.6
Inspur (Suzhou) Financial Technology Service Co Ltd [Member]          
Related Party Transaction [Line Items]          
Strategic alliance, ownership percentage 40.00%   40.00%    
Aisino-Wincor Retail And Banking Systems (Shanghai) Co.,Ltd [Member]          
Related Party Transaction [Line Items]          
Strategic alliance, ownership percentage 43.60%   43.60%