Financing Agreement - Debt Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Nov. 16, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 31, 2018
Debt Instrument [Line Items]
Weighted-average interest rate as of December 31	5.67%		5.33%	1.77%
Long-term debt	$ 1,858.2		$ 1,990.9	$ 1,726.0
Present value of lease payments	10.3
Unamortized debt issuance costs and discounts	(14.3)		(5.9)
Total financing obligations	1,908.4		2,057.8
Less: Current financing obligations	54.0		553.6
Total long-term financing obligations	1,854.4		1,504.2
Term Loan, 364 Day [Member]
Debt Instrument [Line Items]
Line of Credit, Current	$ 0.0		500.0
Incremental term loan
Debt Instrument [Line Items]
Average interest rate	4.72%
Long-term line of credit	$ 228.2		312.9
Senior Notes | Senior Unsecured Notes 4.23 Percent, Due July 2028
Debt Instrument [Line Items]
Interest rate, stated percentage	4.23%
Long-term debt	$ 350.0		350.0		$ 350.0
Senior Notes | Public Senior Note Six Point Nine Five Percent Due March Twenty Twenty-Nine
Debt Instrument [Line Items]
Interest rate, stated percentage	6.95%	6.95%
Long-term debt	$ 500.0		0.0
Finance lease obligations
Debt Instrument [Line Items]
Weighted-average interest rate as of December 31	5.22%
Present value of lease payments	$ 10.3		11.4
Notes payable and other
Debt Instrument [Line Items]
Interest rate, stated percentage	4.26%
Notes payable and other | Notes Payable 3.50 Percent Due June 2027
Debt Instrument [Line Items]
Long-term debt	$ 54.2		61.4
Long-term Debt
Debt Instrument [Line Items]
Interest rate at period end	6.58%
Long-term line of credit	$ 780.0		$ 828.0