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Pension Plans and Other Postretirement Benefits - Pension and Postretirement Plan Contributions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Employer contributions	$ 3.2	$ 2.7	$ 22.1	$ 7.9
Payment for other postretirement benefits	$ 0.7	$ 0.9	$ 2.1	$ 2.5

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- References

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- Definition

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

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Amount of cash outflow for other postretirement benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes pension benefit.

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