Debt and Credit Arrangements Debt Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt Instrument [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax (Deprecated 2025)	$ 1.0	$ 0.9
Unsecured Debt 4.65% Notes [Member]
Debt Instrument [Line Items]
Par Value	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage	4.65%
Maturity Date	Oct. 01, 2028
Debt Instrument, Unamortized Discount (Premium), Net	$ 0.6
Debt Issuance Costs, Net	1.6
4.750% Notes Due 2030 (less unamortized discount and issuance costs of $2.8 and $4.1, respectively)
Debt Instrument [Line Items]
Par Value	$ 650.0
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Maturity Date	Mar. 30, 2030
Debt Instrument, Unamortized Discount (Premium), Net	$ 2.1
Debt Issuance Costs, Net	$ 3.1
Unsecured Debt 2.400% Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.40%
2.400% Notes Due 2031 (less unamortized discount and issuance costs of $0.6 and $3.6, respectively)
Debt Instrument [Line Items]
Par Value	$ 500.0
Maturity Date	Mar. 01, 2031
Debt Instrument, Unamortized Discount (Premium), Net	$ 0.5
Debt Issuance Costs, Net	$ 2.8
3.375% Notes Due 2041 (less unamortized discount and issuance costs of $1.0 and $5.1, respectively)
Debt Instrument [Line Items]
Maturity Date	Mar. 01, 2041
Debt Instrument, Unamortized Discount (Premium), Net	$ 0.9
Debt Issuance Costs, Net	4.6
Unsecured Debt 5.40% Notes [Member]
Debt Instrument [Line Items]
Par Value	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage	5.40%
Maturity Date	Oct. 01, 2048
Debt Instrument, Unamortized Discount (Premium), Net	$ 2.5
Debt Issuance Costs, Net	4.4
Unsecured Debt 3.375% Note
Debt Instrument [Line Items]
Par Value	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage	3.375%
5.375% Notes Due 2033 (less unamortized discount and issuance costs of $3.7 and $3.3, respectively)
Debt Instrument [Line Items]
Par Value	$ 300.0
Debt Instrument, Interest Rate, Stated Percentage	5.375%
Maturity Date	Jun. 15, 2033
Debt Instrument, Unamortized Discount (Premium), Net	$ 3.2
Debt Issuance Costs, Net	$ 2.6