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Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Schedule of Future Estimated Amortization Expense, Other Intangible Assets  
2019 $ 56.9
2020 43.3
2021 35.7
2022 29.6
2023 $ 27.0