Pension Plans - Qualified and Non-Qualified Plans - Adjustments to Equity (Details) - Pension Plan [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Change in equity as a result of change in deferred net loss	$ 9.9	$ (2.3)	$ 2.1
Change in equity as result of change in deferred net loss taxes	$ 0.0	$ 0.0	$ 0.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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