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v3.19.3.a.u2

Long-Term Debt - Interest Expense and Interest Income Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Interest Expense | $ 217.3 | $ 216.3 | $ 195.6 |
Interest Costs Capitalized | $ 15.5 | $ 28.4 | $ 18.3 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 5.80% | 5.90% | 5.70% |
Investment Income, Interest | $ 5.8 | $ 2.0 | $ 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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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