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Segment Information - Revenue by Service/Product Solution (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue from External Customer [Line Items]        
Services $ 583.9 $ 605.8 $ 1,769.6 $ 1,759.3
Products 414.6 397.0 1,156.4 1,262.2
Software 120.5 119.9 362.8 337.9
Total net sales $ 1,119.0 $ 1,122.7 $ 3,288.8 $ 3,359.4