Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Liabilities:
Notes Payable, Fair Value Disclosure	$ 2,161.3	$ 2,228.2
Long-Term Debt	2,370.2	2,458.7
Fair Value, Recurring [Member]
Liabilities:
Liabilities Measured at Net Asset Value	14.3	12.9
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Assets:
Cash Equivalents	12.3	0.4
Short-Term Investments in Marketable Securities	0.8	0.8
Restricted Cash	16.9	11.1
Liabilities:
Deferred Compensation	1.0	1.5
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Assets:
Derivatives	22.1	5.2
Liabilities:
Derivatives	9.4	13.7
Deferred Compensation	$ 19.2	$ 16.1