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Employee Retirement Plans (Plan Assets and Investment Strategy) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	$ 443.5	$ 469.0	$ 436.8
Debt securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation percentage of assets	75.00%
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Actual plan asset allocations	74.00%
Equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation percentage of assets	25.00%
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Actual plan asset allocations	26.00%
Redemption Notice Period | JP Morgan Chase Bank Strategic Property Fund
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	30 days
Redemption Notice Period | Pyramis Long Corporate A or Better
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	15 days
Redemption Notice Period | Pyramis Long Duration
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	15 days
Redemption Notice Period | Russell 3000 Index NL
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	1 day
Redemption Notice Period | Pyramis 810 Corporate
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	15 days
Fair Value, Recurring | Level 1
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	$ 3.2	5.3
Fair Value, Recurring | Level 2
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	142.8	154.6
Fair Value, Recurring | Level 3
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring | NAV
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	297.5	309.1
Fair Value, Recurring | NAV | JP Morgan Chase Bank Strategic Property Fund
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	12.8	12.8
Fair Value, Recurring | NAV | Pyramis Long Corporate A or Better
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	55.4	98.5
Fair Value, Recurring | NAV | Pyramis Long Duration
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	46.9	98.8
Fair Value, Recurring | NAV | Russell 3000 Index NL
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	81.1	99.0
Fair Value, Recurring | NAV | Pyramis 810 Corporate
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	101.3	0.0
Fair Value, Recurring | Cash and cash equivalents
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	3.2	5.3
Fair Value, Recurring | Cash and cash equivalents | Level 1
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	3.2	5.3
Fair Value, Recurring | Cash and cash equivalents | Level 2
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring | Cash and cash equivalents | Level 3
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring | Debt securities
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	120.6	125.7
Fair Value, Recurring | Debt securities | Level 1
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring | Debt securities | Level 2
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	120.6	125.7
Fair Value, Recurring | Debt securities | Level 3
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring | Equity securities
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	22.2	28.9
Fair Value, Recurring | Equity securities | Level 1
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring | Equity securities | Level 2
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	22.2	28.9
Fair Value, Recurring | Equity securities | Level 3
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring | Pension Plan Assets, Excluding Investments Measured At NAV
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	$ 146.0	$ 159.9

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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