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Interest Expense and Investment Income (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Interest Expense | $ 216.3 | $ 195.6 | $ 93.4 |
Interest Costs Capitalized | $ 28.4 | $ 18.3 | $ 6.5 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 5.90% | 5.70% | 6.60% |
Investment Income, Interest | $ 2.0 | $ 2.9 | $ 2.9 |
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 700.0 | 700.0 |  | $ 700.0
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |  | 6.25%
Unsecured Debt [Member] | 6.50% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 500.0 | $ 500.0 |  | $ 500.0
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |  | 6.50%

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