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Employee Retirement Plans (Estimated Contributions and Benefit Payments) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Pension Benefits  
Defined Benefit Plan, Estimated Future Benefit Payments  
2022 $ 37.0
2023 34.9
2024 33.9
2025 33.1
2026 32.0
2027 - 2031 141.0
Thereafter 150.8
Total 462.7
Qualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions in next fiscal year 0.0
Nonqualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions in next fiscal year $ 1.6