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Long-Term Debt and Commercial Paper (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Long-Term Debt | Long-term debt consists of the following:
Debt Description |  | Maturity Date |  | Interest Payable |  | June 30, 2018 |  | December 31, 2017
6.75% Senior Notes |  | April 15, 2018 |  | April 15 and October 15 |  | $ | — |  |  | $ | 400.0 |
5.5% Senior Notes |  | February 1, 2020 |  | February 1 and August 1 |  | 350.0 |  |  | 350.0 |
3.35% Senior Notes |  | January 15, 2021 |  | January 15 and July 15 |  | 300.0 |  |  | 300.0 |
3.5% Senior Notes |  | November 15, 2024 |  | May 15 and November 15 |  | 450.0 |  |  | 450.0 |
4.5% Senior Notes |  | October 1, 2025 |  | April 1 and October 1 |  | 450.0 |  |  | 450.0 |
3.8% Senior Notes |  | November 15, 2027 |  | May 15 and November 15 |  | 300.0 |  |  | 300.0 |
Revolving credit facility |  | October 19, 2022 |  | Monthly |  | — |  |  | — |
Capital leases and other debt |  | Various dates through 2037 |  | Monthly |  | 133.9 |  |  | 139.4 |
|  |  |  |  |  | 1,983.9 |  |  | 2,389.4 |
Less: unamortized debt discounts and debt issuance costs |  | (13.8 | ) |  | (15.7 | )
Less: current maturities |  |  |  |  |  | (12.0 | ) |  | (414.5 | )
Long-term debt, net of current maturities |  |  |  | $ | 1,958.1 |  |  | $ | 1,959.2 |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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