Debt and Credit Facilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Apr. 25, 2022	Feb. 28, 2022	Dec. 31, 2021
Long-term debt excluding current maturities	$ 4,492.6				$ 4,491.7
Short-term borrowings and current maturities of long-term debt	350.4				350.4
Repayments of Long-term Debt	0.0	$ 300.0
Debt Instrument, Fair Value Disclosure	5,100.0				5,600.0
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	342.9				342.9
Debentures with put option available to be exercised				$ 37.2
Three Point Five Percent Senior notes Due Two Thousand Twenty Six [Member]
Long-term debt excluding current maturities	$ 398.0				$ 397.8
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	$ 745.2				$ 745.0
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	$ 345.9				$ 345.9
Debt Instrument, Interest Rate, Stated Percentage	4.50%				4.50%
4.25% Senior notes due 2023 [Member]
Long-term debt excluding current maturities	$ 699.2				$ 699.1
Debt Instrument, Interest Rate, Stated Percentage	4.25%				4.25%
5.75% Senior notes due 2043 [Member]
Long-term debt excluding current maturities	$ 495.0				$ 495.0
Debt Instrument, Interest Rate, Stated Percentage	5.75%				5.75%
Three Point Five Five Percent Senior Notes due 2024 [Member]
Long-term debt excluding current maturities	$ 498.2				$ 498.0
Debt Instrument, Interest Rate, Stated Percentage	3.55%				3.55%
Four Point Six Five Percent Senior Notes due Twenty Forty Four [Member]
Long-term debt excluding current maturities	$ 296.3				$ 296.3
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
2023 Revolving Credit Facility
Line of credit facility, amount outstanding	$ 1,000.0
2023 Revolving Credit Facility | Subsequent Event
Line of credit facility, amount outstanding			$ 1,000.0
2027 Revolving Credit Facility | Subsequent Event
Line of credit facility, amount outstanding			$ 1,000.0