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Summary of Contractual Obligations for Long-term Debt (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]  
Total $ 571.8
2021 57.2
2022 50.6
2023 47.9
2024 39.0
2025 37.6
2026 & Beyond 339.5
Long Term Debt Comprising Principal And Interest [Member]  
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]  
Total 923.2
2021 35.1
2022 48.5
2023 30.9
2024 30.5
2025 30.1
2026 & Beyond 748.1
Long-Term Debt [Member] | Long Term Debt Comprising Principal And Interest [Member]  
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]  
Total 535.4
2021 8.8
2022 23.4
2023 6.9
2024 7.0
2025 7.0
2026 & Beyond 482.3
Interest on Long-Term Debt [Member] | Long Term Debt Comprising Principal And Interest [Member]  
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]  
Total 387.8
2021 26.3
2022 25.1
2023 24.0
2024 23.5
2025 23.1
2026 & Beyond $ 265.8