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Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Schedule of Future Estimated Amortization Expense, Other Intangible Assets  
2018 $ 42.4
2019 37.2
2020 30.6
2021 26.1
2022 $ 22.7