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Goodwill and Other Assets (Textuals) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segments
Jun. 30, 2016
USD ($)
Impairment of assets $ 0.0 $ 0.0 $ 3.1 $ 0.0
Number of reportable segments | segments     3  
Amortization of internally-developed software 9.7 2.6 $ 19.3 5.8
Amortization $ 39.5 $ 4.5 $ 78.9 $ 9.4
Document Period End Date     Jun. 30, 2017