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Goodwill and Identifiable Intangible Assets - Schedule of Expected Amortization Expense (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 114.2
2020 113.9
2021 113.3
2022 111.1
2023 $ 71.3