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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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