Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 8.9	$ 36.4	$ 88.2
Increase Decrease in Capital Expenditures Incurred But Not Yet Paid	18.6	(29.8)	63.2
Accrued dividends	43.6	20.4
Cash paid (received) during the period for:
Interest	220.0	232.8	231.3
Less amount capitalized	30.1	33.3	28.5
Cash interest, net	189.9	199.5	202.8
Income taxes	208.6	6.2	46.5
Dividends payable		20.4	20.0
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	8.9	36.4	88.2
Depreciation	811.8	846.4	877.6
Amortization of Intangible Assets	$ 1.1	$ 1.2	$ 5.1