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Debt - Debt Outstanding Matures on Calendar Year Basis (Detail)
$ in Millions
Jun. 30, 2021
USD ($)
Debt Disclosure [Abstract]  
Q3-Q4 2021 $ 0.0
2022 88.3
2023 216.1
2024 0.0
2025 19.3
2026 0.0
Thereafter 400.0
Total debt $ 723.7