Fair Value of Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Recorded at Fair Market Value

Assets and liabilities subject to fair value measurement by fair value level are recorded as follows:

		Successor						Predecessor
		September 30, 2023						December 31, 2022
				Fair Value Measurements Using						Fair Value Measurements Using
	Classification on condensed consolidated Balance Sheets	Fair Value		Level 1		Level 2		Fair Value		Level 1		Level 2
Assets
Certificates of deposit	Short-term investments	$	16.6	$	16.6	$	—	$	24.6	$	24.6	$	—
Assets held in rabbi trusts	Securities and other investments	2.8		2.8		—		4.4		4.4		—
Total		$	19.4	$	19.4	$	—	$	29.0	$	29.0	$	—
Liabilities
Deferred compensation	Other liabilities	2.8		2.8		—		4.4		4.4		—
Total		$	2.8	$	2.8	$	—	$	4.4	$	4.4	$	—