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Other Charges, Net - Components (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Charges, Net        
Information technology transformation costs $ 0.8 $ 1.6 $ 2.9 $ 5.5
Restructuring charges 3.0 2.8 6.9 6.4
Acquisition-related charges 0.5 0.2 3.8 8.1
Other     0.2 0.6
Other charges, net $ 4.3 $ 4.6 $ 13.8 $ 20.6