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Goodwill and Intangible Assets - Estimated Aggregate Intangible Asset Amortization Expense (Details)
$ in Millions
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 20.5
2019 20.6
2020 12.5
2021 10.8
2022 $ 8.1