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Long-term Debt - Schedule of Long-term Debt Maturity (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Junior subordinated debentures  
Debt Instrument [Line Items]  
Total $ 421.4
2022 10.4
2023 11.3
2024 11.8
2025 11.8
2026 11.8
Thereafter 364.3
Senior unsecured fixed rate notes  
Debt Instrument [Line Items]  
Total 335.4
2022 9.3
2023 9.4
2024 9.3
2025 9.4
2026 9.3
Thereafter 288.7
Floating rate loan stock  
Debt Instrument [Line Items]  
Total 88.6
2022 2.1
2023 2.2
2024 2.2
2025 2.2
2026 2.2
Thereafter $ 77.7