Segments - Holdings - Selected Financial Information by Reportable Operating Segment (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenues		$ 579.2	$ 610.7
Adjusted EBITDA		70.7	86.2
Capital expenditures		23.5	26.3
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA		70.7	86.2
Eliminations
Segment Reporting Information [Line Items]
Revenues		(2.1)	(2.6)
U.S. Operating Segment
Segment Reporting Information [Line Items]
Revenues	[1]	457.0	479.1
U.S. Operating Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues		459.1	481.7
Adjusted EBITDA		49.1	63.4
Capital expenditures		18.1	22.7
International Operating Segment
Segment Reporting Information [Line Items]
Revenues		122.2	131.6
International Operating Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues		122.2	131.6
Adjusted EBITDA		21.6	22.8
Capital expenditures		$ 5.4	$ 3.6

[1] U.S. segment revenue excludes intercompany transactions with the international operating segment. See Note 16 for the amount of intercompany eliminations for the periods presented.