Employee Retirement Plans (Estimated Contributions and Benefit Payments) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Pension Benefits
Defined Benefit Plan, Estimated Future Benefit Payments
2019	$ 39.4
2020	38.1
2021	37.0
2022	35.6
2023	34.7
2025 – 2029	158.4
Thereafter	172.5
Total	515.7
Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions in next fiscal year	11.1
Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions in next fiscal year	$ 1.9

Defined Benefit Plan, Expected Future Benefit Payments, Thereafter

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