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Retirement Plans and Other Postretirement Benefits - Contributions and Plan Assets (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure
Contributions to employees' accounts	$ 0.0	$ 0.0	$ 0.0
Total assets at the end of the year	19.8	22.0	23.2	$ 22.1
Qualified Plan \| 401(k) plan
Defined Benefit Plan Disclosure
Contributions to employees' accounts	8.2	8.2	8.2
Total assets at the end of the year	246.9	228.4	206.2
Nonqualified Plan
Defined Benefit Plan Disclosure
Total assets at the end of the year	0.0	0.0	0.0
Contributions to employees' accounts	$ 0.1	$ 0.1	$ 0.1

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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.

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