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Debt and Credit Arrangements (Tables) | 6 Months Ended
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Jun. 30, 2020
Debt Disclosure [Abstract] |
Summary of Carrying Amounts and Fair Values of Long-term Debt | A summary of the carrying amounts of our long-term debt is listed below.
|  | Effective Interest Rate |  | June 30, 2020 |  | December 31, 2019
| 3.50% Senior Notes due 2020 (less unamortized discount and issuance costs of $0.1 and $0.4, respectively) | 3.89% |  | $ | 499.5 |  |  | $ | 498.5 |
| 3.75% Senior Notes due 2021 (less unamortized discount and issuance costs of $0.2 and $1.3, respectively) | 3.98% |  | 498.5 |  |  | 497.9 |
| 4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $0.6 and $0.4, respectively) | 4.13% |  | 249.0 |  |  | 248.7 |
| 3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.4 and $1.1, respectively) | 4.32% |  | 498.5 |  |  | 498.2 |
| 4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.4 and $1.6, respectively) | 4.24% |  | 498.0 |  |  | 497.8 |
| 4.65% Senior Notes due 2028 (less unamortized discount and issuance costs of $1.4 and $3.7, respectively) | 4.78% |  | 494.9 |  |  | 494.6 |
| 4.75% Senior Notes due 2030 (less unamortized discount and issuance costs of $3.7 and $6.0, respectively) | 4.92% |  | 640.3 |  |  | — |
| 5.40% Senior Notes due 2048 (less unamortized discount and issuance costs of $2.7 and $5.3, respectively) | 5.48% |  | 492.0 |  |  | 491.9 |
| Other notes payable and capitalized leases |  |  | 44.0 |  |  | 46.3 |
| Total long-term debt |  |  | 3,914.7 |  |  | 3,273.9 |
| Less: current portion |  |  | 503.0 |  |  | 502.0 |
| Long-term debt, excluding current portion |  |  | $ | 3,411.7 |  |  | $ | 2,771.9 |

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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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