Post Retirement Benefit Plans - Balance Sheet and AOCI (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts recognized in the accompanying consolidated balance sheets:
Current liabilities	$ (1.6)	$ (1.6)
Non-current liabilities	(122.0)	(90.5)
Net amount recognized	(123.6)	(92.1)	$ (107.7)
Pre-tax amounts recognized in accumulated other comprehensive income:
Prior service cost	(6.0)	(6.9)	(9.7)
Net actuarial loss	(62.3)	(32.0)	(48.9)
Accumulated other comprehensive loss	(68.3)	(38.9)	(58.6)
Accumulated contributions in excess of net periodic benefit cost	(55.3)	(53.2)	(49.1)
Net amount recognized	(123.6)	$ (92.1)	$ (107.7)
Accumulated other comprehensive income expected to be recognized as amortization of net loss within net periodic benefit cost in 2020	$ 4.7

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

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

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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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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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