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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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Contractual interest rate for funds borrowed, under the debt agreement.

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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