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Employee Benefits - Plan Assets and Investment Policy (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Employee Benefits
Weighted-average asset allocations (as a percent)	100.00%	100.00%
Fair value of plan assets		$ 104.7
Investments measured at net asset value (NAV)		2.4
Total investments at fair value	$ 63.9	107.1
Level 1
Employee Benefits
Fair value of plan assets		91.8
Total investments at fair value	52.6	91.8
Level 2
Employee Benefits
Fair value of plan assets		12.9
Total investments at fair value	11.3	12.9
Equity securities
Employee Benefits
Fair value of plan assets	30.6	25.1
Equity securities | Level 1
Employee Benefits
Fair value of plan assets	30.6	25.1
U.S. government, state, and agency
Employee Benefits
Fair value of plan assets	7.4	9.3
U.S. government, state, and agency | Level 2
Employee Benefits
Fair value of plan assets	7.4	9.3
Corporate debt securities
Employee Benefits
Fair value of plan assets	3.9	3.6
Corporate debt securities | Level 2
Employee Benefits
Fair value of plan assets	3.9	3.6
Mutual funds
Employee Benefits
Fair value of plan assets	18.4	59.4
Mutual funds | Level 1
Employee Benefits
Fair value of plan assets	18.4	59.4
Cash and cash equivalents
Employee Benefits
Fair value of plan assets	3.6	7.3
Cash and cash equivalents | Level 1
Employee Benefits
Fair value of plan assets	$ 3.6	$ 7.3
Equity securities
Employee Benefits
Weighted-average asset allocations (as a percent)	62.00%	33.00%
Debt securities
Employee Benefits
Weighted-average asset allocations (as a percent)	32.00%	60.00%
Cash and cash equivalents
Employee Benefits
Weighted-average asset allocations (as a percent)	6.00%	7.00%

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- Definition

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 excluding NAV valuation.

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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 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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