Debt, including Finance Lease Obligations - Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Line of Credit Facility
Long-term debt, gross	$ 1,334.0	$ 1,405.2
Less: debt issuance costs	3.7	4.2
Total debt including finance lease obligations, net of debt issuance costs	1,330.3	1,401.0
Less: debt maturing within one year	94.7	61.3
Long-term debt including finance lease obligations	1,235.6	1,339.7
Restricted investments	83.0	81.6
Wickliffe, Kentucky Manufacturing Facility
Line of Credit Facility
Present value of lease liabilities	80.0	80.0
Revolving Credit Facility and other lines of credit
Line of Credit Facility
Long-term debt, gross	591.0	695.0
Letters of credit outstanding	9.0	2.6
Available under the facility	$ 400.0	$ 302.4
Weighted average interest rate	6.59%	7.48%
Senior Notes | 3.88% Senior Notes due 2028
Line of Credit Facility
Stated rate	3.88%
Long-term debt, gross	$ 550.0	$ 550.0
Finance lease obligations
Line of Credit Facility
Long-term debt, gross	99.5	100.0
Accounts receivable securitization
Line of Credit Facility
Long-term debt, gross	$ 91.4	$ 58.3
Weighted average interest rate	5.25%	6.65%
Other notes payable
Line of Credit Facility
Long-term debt, gross	$ 2.1	$ 1.9