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Other Intangible Assets - Estimated Amortization Expense (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2019 $ 58.2
2020 47.2
2021 36.3
2022 25.2
2023 $ 14.2