Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for Doubtful Accounts and Bilinig Adjustments
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 4.0	$ 3.1	$ 3.9
Provisions	1.8	2.0	0.4
Deductions	(1.8)	(1.1)	(1.2)
Balance at end of year	4.0	4.0	3.1
Allowance for Workers' Compensation and Medical Malpractice Loss Reserves
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	12.8	12.8	13.1
Provisions	3.4	3.2	3.3
Deductions	(2.8)	(3.2)	(3.6)
Balance at end of year	$ 13.4	$ 12.8	$ 12.8