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Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Summary of Debt | At December 31, 2020 and 2019, our long-term debt and interest rates on that debt were as follows (dollars in millions):
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Amount |  |  | Interest Rate |  |  | Amount |  |  | Interest rate |
Revolving Credit Facility, due August 2021 |  | $ | — |  |  |  | — | % |  | $ | — |  |  |  | — | %
4.50% Senior Notes, net of discount of $0.6 million and $0.8 million as of December 31, 2020 and 2019, respectively, due November 2023 |  |  | 699.4 |  |  |  | 4.50 | % |  |  | 699.2 |  |  |  | 4.50 | %
3.65% Senior Notes, net of discount of $0.5 million and $0.6 million as of December 31, 2020 and 2019, respectively, due September 2024 |  |  | 399.5 |  |  |  | 3.65 | % |  |  | 399.4 |  |  |  | 3.65 | %
3.40% Senior Notes, net of discount of $1.2 million and $1.3 million as of December 31, 2020 and 2019, respectively, due December 2027 |  |  | 498.8 |  |  |  | 3.40 | % |  |  | 498.7 |  |  |  | 3.40 | %
3.00% Senior Notes, net of discount of $0.6 million and $0.7 million as of December 31, 2020 and 2019, respectively, due December 2029 |  |  | 499.4 |  |  |  | 3.00 | % |  |  | 499.3 |  |  |  | 3.00 | %
4.05% Senior Notes, net of discount of $3.4 million and $3.5 million as of December 31, 2020 and 2019, respectively, due December 2049 |  |  | 396.6 |  |  |  | 4.05 | % |  |  | 396.5 |  |  |  | 4.05 | %
Total |  |  | 2,493.7 |  |  |  | 3.77 | % |  |  | 2,493.1 |  |  |  | 3.77 | %
Less current portion |  |  | — |  |  |  | — | % |  |  | — |  |  |  | — | %
Less unamortized debt issuance costs |  |  | 14.3 |  |  |  |  |  |  |  | 16.3 |  |  |  |  |
Total long-term debt |  | $ | 2,479.4 |  |  |  | 3.77 | % |  | $ | 2,476.8 |  |  |  | 3.77 | %

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: 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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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