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Investments (Textuals) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Accounts receivable with affiliates $ 12.2   $ 12.2   $ 15.6
Accounts payable with affiliates 17.2   17.2   17.8
Investments (Textuals)          
Cash surrender value of insurance contracts 79.9   79.9   79.8
Interest rate swap asset, carrying value and fair value 9.5   9.5   $ 7.6
Realized gains and proceeds from the sale of securities $ 0.0 $ 0.0 $ 0.0 $ 0.0  
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%