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Long-Term Debt - Interest Expense and Interest Income Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Interest Expense	$ 212.3	$ 217.3	$ 216.3
Interest Costs Capitalized	$ 7.9	$ 15.5	$ 28.4
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.80%	5.80%	5.90%
Investment Income, Interest	$ 11.6	$ 5.8	$ 2.0

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Amount of interest capitalized during the period.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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