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Long-Term Debt - Interest Expense and Interest Income Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Interest Expense	$ 195.2	$ 212.3	$ 217.3
Interest Costs Capitalized	$ 6.2	$ 7.9	$ 15.5
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.60%	5.80%	5.80%
Investment Income, Interest	$ 10.9	$ 11.6	$ 5.8

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

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