Debt and Credit Agreements Debt Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of New Debt Issuance [Line Items]
Loss on Extinguishment of Debt	$ 0.0	$ 74.0	$ 0.0
Recognition of previously unrealized losses included in net income	1.4	$ (4.2)	$ (2.4)
Debt Instrument, Fair Value Disclosure	36.1
4.00% Notes Due 2022
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	250.0
3.75% Notes Due 2023
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
4.20% Notes Due 2024
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	250.0
Debt instrument, unamortized discount	0.0
4.65% Notes Due 2028
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	1.0
4.75% Note Due 2030
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	650.0
Debt instrument, unamortized discount	2.9
5.40% Notes Due 2048
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	2.6
2.400% Note Due 2031 (less unamortized discount and issuance costs of $0.7 and $4.3, respectively)
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	0.7
3.375% Note Due 2041 (less unamortized discount and issuance costs of $1.1 and $5.5, respectively)
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	500.0
Debt instrument, unamortized discount	1.0
Unsecured Debt 4.200% Notes Original Principal
Schedule of New Debt Issuance [Line Items]
Debt Instrument, Face Amount	$ 500.0