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Goodwill And Other Acquired Intangible Assets - Estimated Future Amortization Expense for Acquired Intangible Assets Subject to Amortization (Detail)
$ in Millions
Jun. 30, 2019
USD ($)
Estimated Future Amortization Expense for Acquired Intangible Assets Subject to Amortization [Abstract]  
2019 (after June 30) $ 48.5
2020 95.9
2021 95.7
2022 95.7
2023 92.6
Thereafter 1,057.6
Total estimated future amortization $ 1,486.0