Post Retirement Benefit Plans - Balance Sheet and AOCI (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amounts recognized in the accompanying consolidated balance sheets:
Current liabilities	$ (1.8)	$ (1.9)
Non-current liabilities	(104.3)	(122.8)
Net amount recognized	(106.1)	(124.7)
Pre-tax amounts recognized in accumulated other comprehensive income:
Prior service cost	9.4	(2.4)	$ (6.0)
Net actuarial loss	(50.1)	(56.6)	(62.3)
Accumulated other comprehensive loss	(40.7)	(59.0)	(68.3)
Accumulated contributions in excess of net periodic benefit cost	(65.4)	(65.7)	(55.3)
Net amount recognized	(106.1)	$ (124.7)	$ (123.6)
Accumulated other comprehensive income expected to be recognized as amortization of net loss within net periodic benefit cost in 2020	$ 2.1

Defined benefit plan, amounts for asset (liability) recognized in statement of comprehensive income.

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- Definition

The cumulative employer contributions in excess of net periodic benefit cost for defined benefit plans.

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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- Definition

Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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