Debt and Credit Facilities (Short-Term Borrowings and Current Maturities of Long-Term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Short-term borrowings and current maturities of long-term debt	$ 348.3	$ 1,048.0
Debentures With Put Feature [Member]
Short-term borrowings and current maturities of long-term debt	340.8	340.8
Commercial Paper [Member]
Short-term borrowings and current maturities of long-term debt	0.0	0.0
Current Maturities Of Long Term Debt [Member]
Short-term borrowings and current maturities of long-term debt	7.5	7.5
4.25% Senior notes due 2023 [Member]
Short-term borrowings and current maturities of long-term debt	$ 0.0	$ 699.7
Debt Instrument, Interest Rate, Stated Percentage		4.25%