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Goodwill and Other Intangibles - Annual Amortization Expense (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Estimated future annual amortization expense for acquired intangible assets    
Remainder of 2017 $ 12.8  
2018 12.2  
2019 11.4  
2020 9.9  
2021 9.4  
Thereafter 27.0  
Net Carrying Amount $ 82.7 $ 87.0