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Pension Plans - Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial gain / (loss)	$ 38.8	$ (26.9)	$ (7.5)
Amortization of actuarial loss	3.8	2.6	3.1
Prior service cost	0.0	(0.1)	0.0
Amortization of prior service credit	(0.4)	(0.4)	(0.4)
Total recognized in other comprehensive income / (loss)	42.2	(24.8)	(4.8)
Total recognized in net periodic benefit cost and other comprehensive income / (loss)	44.1	(20.9)	$ (2.0)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Gross actuarial loss	(122.5)	(165.1)
Gross prior service credit	11.4	11.8
Total included in AOCI not yet recognized in the statement of income	$ (111.1)	$ (153.3)

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- Definition

Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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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, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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