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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Jun. 12, 2020 | Dec. 31, 2019
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Long-Term Debt |  |  |
Long-term debt principal | $ 4,198.3 |  | $ 3,763.2
Net unamortized discount, premium and debt issuance costs | (34.9) |  | (29.1)
Long-term debt carrying amount | $ 4,163.4 |  | $ 3,734.1
3.3% notes payable, due 2022 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 3.30% |  | 3.30%
Long-term debt principal | $ 300.0 |  | $ 300.0
Net unamortized discount, premium and debt issuance costs | (0.9) |  | (1.0)
Long-term debt carrying amount | $ 299.1 |  | $ 299.0
3.125% notes payable, due 2023 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 3.125% |  | 3.125%
Long-term debt principal | $ 300.0 |  | $ 300.0
Net unamortized discount, premium and debt issuance costs | (0.8) |  | (1.0)
Long-term debt carrying amount | $ 299.2 |  | $ 299.0
3.4% notes payable, due 2025 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 3.40% |  | 3.40%
Long-term debt principal | $ 400.0 |  | $ 400.0
Net unamortized discount, premium and debt issuance costs | (2.4) |  | (2.6)
Long-term debt carrying amount | $ 397.6 |  | $ 397.4
3.1% notes payable, due 2026 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 3.10% |  | 3.10%
Long-term debt principal | $ 350.0 |  | $ 350.0
Net unamortized discount, premium and debt issuance costs | (2.2) |  | (2.5)
Long-term debt carrying amount | $ 347.8 |  | $ 347.5
3.7% notes payable, due 2029 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 3.70% |  | 3.70%
Long-term debt principal | $ 500.0 |  | $ 500.0
Net unamortized discount, premium and debt issuance costs | (5.8) |  | (6.1)
Long-term debt carrying amount | $ 494.2 |  | $ 493.9
2.125% notes payable, due 2030 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 2.125% |  |
Long-term debt principal | $ 500.0 |  |
Net unamortized discount, premium and debt issuance costs | (6.9) |  |
Long-term debt carrying amount | $ 493.1 |  |
2.125% notes payable, due 2030 | Senior notes |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) |  | 2.125% |
Long-term debt issued |  | $ 500.0 |
6.05% notes payable, due 2036 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 6.05% |  | 6.05%
Long-term debt principal | $ 505.6 |  | $ 505.6
Net unamortized discount, premium and debt issuance costs | (2.5) |  | (2.4)
Long-term debt carrying amount | $ 503.1 |  | $ 503.2
4.625% notes payable, due 2042 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 4.625% |  | 4.625%
Long-term debt principal | $ 300.0 |  | $ 300.0
Net unamortized discount, premium and debt issuance costs | (3.2) |  | (3.2)
Long-term debt carrying amount | $ 296.8 |  | $ 296.8
4.35% notes payable, due 2043 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 4.35% |  | 4.35%
Long-term debt principal | $ 300.0 |  | $ 300.0
Net unamortized discount, premium and debt issuance costs | (3.1) |  | (3.3)
Long-term debt carrying amount | $ 296.9 |  | $ 296.7
4.3% notes payable, due 2046 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 4.30% |  | 4.30%
Long-term debt principal | $ 300.0 |  | $ 300.0
Net unamortized discount, premium and debt issuance costs | (3.3) |  | (3.3)
Long-term debt carrying amount | $ 296.7 |  | $ 296.7
4.7% notes payable, due 2055 |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) | 4.70% |  | 4.70%
Long-term debt principal | $ 400.0 |  | $ 400.0
Net unamortized discount, premium and debt issuance costs | (4.9) |  | (4.9)
Long-term debt carrying amount | 395.1 |  | 395.1
Non-recourse mortgages and notes payable |  |  |
Long-Term Debt |  |  |
Long-term debt principal | 42.7 |  | 107.6
Net unamortized discount, premium and debt issuance costs | 1.1 |  | 1.2
Long-term debt carrying amount | $ 43.8 |  | $ 108.8

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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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