Employee Benefit Plans - Funded status of the defined benefit plans (Details) $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Change in projected benefit obligation
Balance at beginning of the year	$ 68.0
Interest costs on benefit obligation	0.7	$ 0.7
Actuarial loss (gain)	5.5
Benefits paid	(0.7)
Balance at end of year	73.5	73.5
Change in fair value of plan assets
Balance at beginning of the year	67.9
Actual (loss) gain on assets	7.2
Benefits paid	(0.7)
Fair value of plan assets at end of the year	74.4	74.4
Funded (underfunded) status at end of year	$ 0.9	$ 0.9