Debt and Credit Facilities (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Proceeds from long-term debt	$ 498.5	$ 699.1
Long-term debt excluding current maturities	4,316.2		$ 3,977.9
Short-term borrowings and current maturities of long-term debt	952.0		801.9
Repayments of Long-term Debt	7.5	$ 707.5
Debt Instrument, Fair Value Disclosure	5,100.0		4,700.0
Debt Instrument, Repaid, Principal	500.0
Proceeds from Issuance of Debt	500.0
Commercial Paper [Member]
Short-term borrowings and current maturities of long-term debt	0.0		0.0
Debentures With Put Feature [Member]
Short-term borrowings and current maturities of long-term debt	295.0		295.0
Three Point Five Percent Senior notes Due Two Thousand Twenty Six [Member]
Long-term debt excluding current maturities	$ 399.1		$ 398.9
Debt Instrument, Interest Rate, Stated Percentage	3.50%		3.50%
Three Point Eight Percent Senior Notes Due Two Thousand Twenty Nine [Member]
Long-term debt excluding current maturities	$ 746.8		$ 746.4
Debt Instrument, Interest Rate, Stated Percentage	3.80%		3.80%
Four Point Five Percent Senior Notes Due Two Thousand Forty Nine [Member]
Long-term debt excluding current maturities	$ 346.2		$ 346.2
Debt Instrument, Interest Rate, Stated Percentage	4.50%		4.50%
5.75% Senior notes due 2043 [Member]
Long-term debt excluding current maturities	$ 495.6		$ 495.4
Debt Instrument, Interest Rate, Stated Percentage	5.75%		5.75%
Four Point Six Five Percent Senior Notes due Twenty Forty Four [Member]
Long-term debt excluding current maturities	$ 296.7		$ 296.6
Debt Instrument, Interest Rate, Stated Percentage	4.65%		4.65%
Commercial Paper [Member]
Line of credit facility, amount outstanding	$ 2,000.0
Revolving Credit Facility [Member]
Line of Credit Facility, Remaining Borrowing Capacity	2,000.0		$ 2,000.0
2026 Revolving Credit Facility
Line of credit facility, amount outstanding	1,000.0
2027 Revolving Credit Facility
Line of credit facility, amount outstanding	$ 1,000.0

Amount of debt and lease obligation, classified as current.

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