Debt and Credit Facilities (Long-Term Debt Excluding Current Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Long-term debt excluding current maturities	$ 3,924.5	$ 3,922.1
Three Point Seven Five Percent Senior Notes Due Two Thousand Twenty Eight [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.75%	3.75%
Long-term debt excluding current maturities	$ 548.9	$ 548.5
Three Point Eight Percent Senior Notes Due Two Thousand Twenty Nine [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.80%	3.80%
Long-term debt excluding current maturities	$ 748.3	$ 747.8
5.75% Senior notes due 2043 [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.75%	5.75%
Long-term debt excluding current maturities	$ 496.1	$ 495.9
Four Point Six Five Percent Senior Notes due Twenty Forty Four [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.65%	4.65%
Long-term debt excluding current maturities	$ 297.0	$ 296.9
Four Point Three Percent Senior Notes Due Two Thousand Forty Eight [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.30%	4.30%
Long-term debt excluding current maturities	$ 297.0	$ 296.9
Four Point Five Percent Senior Notes Due Two Thousand Forty Nine [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.50%	4.50%
Long-term debt excluding current maturities	$ 346.6	$ 346.5
Five point Twenty-Five Percent Senior Notes Due Two Thousand Thirty Three
Debt Instrument, Interest Rate, Stated Percentage	5.25%	5.25%
Long-term debt excluding current maturities	$ 695.3	$ 694.7
Five point one zero percent senior notes due two thousand thirty four
Debt Instrument, Interest Rate, Stated Percentage	5.10%	5.10%
Long-term debt excluding current maturities	$ 495.3	$ 494.9