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Goodwill and Identifiable Intangible Assets - Schedule of Expected Amortization Expense (Details)
$ in Millions
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remainder of 2018 $ 57.4
2019 114.6
2020 114.4
2021 113.8
2022 111.5
2023 $ 71.8