Employee Benefit Plans - Projected Benefit Obligation and Plan Asset Fund Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amounts recognized on the consolidated balance sheet at December 31:
Non-current liabilities	$ (6.7)	$ (0.9)
United States
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	50.0	63.5
Acquisition of Hudson Plan	0.0	0.0
Interest cost	2.4	1.7	$ 1.7
Service cost	0.0	0.0	0.0
Benefits paid	(3.1)	(3.0)
Actuarial (gains) losses	(1.2)	(12.2)
Foreign exchange rate impact	0.0	0.0
Projected benefit obligation at year end	48.1	50.0	63.5
Accumulated benefit obligation at year end	48.1	50.0
Change in plan assets:
Fair value of plan assets at beginning of year	49.1	61.9
Acquisition of Hudson	0.0	0.0
Actual return	8.0	(9.8)
Employer contributions	0.0	0.0
Benefits paid	(3.1)	(3.0)
Foreign exchange rate impact	0.0	0.0
Fair value of plan assets at year end	54.0	49.1	$ 61.9
Funded status (Accrued pension liabilities)	5.9	(0.9)
Amounts recognized on the consolidated balance sheet at December 31:
Non-current assets	5.9	0.0
Current liabilities	0.0	0.0
Non-current liabilities	0.0	(0.9)
Recognized accrued pension asset (liability)	5.9	(0.9)
Unrecognized actuarial loss recognized in accumulated other comprehensive loss	3.5	10.3
International Plans
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	0.0
Acquisition of Hudson Plan	41.1
Interest cost	1.2
Service cost	0.7
Benefits paid	(2.0)
Actuarial (gains) losses	0.4
Foreign exchange rate impact	1.6
Projected benefit obligation at year end	43.0	0.0
Accumulated benefit obligation at year end	41.2
Change in plan assets:
Fair value of plan assets at beginning of year	0.0
Acquisition of Hudson	38.7
Actual return	1.6
Employer contributions	1.9
Benefits paid	(2.0)
Foreign exchange rate impact	1.6
Fair value of plan assets at year end	41.8	$ 0.0
Funded status (Accrued pension liabilities)	(1.2)
Amounts recognized on the consolidated balance sheet at December 31:
Non-current assets	5.8
Current liabilities	(0.3)
Non-current liabilities	(6.7)
Recognized accrued pension asset (liability)	(1.2)
Unrecognized actuarial loss recognized in accumulated other comprehensive loss	$ 0.1