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Debt and Credit Arrangements (Tables) | 6 Months Ended
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Jun. 30, 2015
Debt Instruments [Abstract] |
Summary of Carrying Amounts and Fair Values of Long-Term Debt | A summary of the carrying amounts and fair values of our long-term debt is listed below.
| Effective Interest Rate |  | June 30, 2015 |  | December 31, 2014
Book Value |  | Fair Value 1 |  | Book Value |  | Fair Value 1
2.25% Senior Notes due 2017 (less unamortized discount of $0.3) | 2.30% |  | $ | 299.7 |  |  | $ | 303.2 |  |  | $ | 299.6 |  |  | $ | 301.2 |
4.00% Senior Notes due 2022 (less unamortized discount of $2.1) | 4.13% |  | 247.9 |  |  | 255.2 |  |  | 247.7 |  |  | 255.2 |
3.75% Senior Notes due 2023 (less unamortized discount of $1.2) | 4.32% |  | 498.8 |  |  | 495.8 |  |  | 498.8 |  |  | 499.8 |
4.20% Senior Notes due 2024 (less unamortized discount of $0.8) | 4.24% |  | 499.2 |  | 505.9 |  | 499.1 |  | 509.8
Other notes payable and capitalized leases |  |  | 79.2 |  |  | 79.2 |  |  | 80.4 |  |  | 80.4 |
Total long-term debt |  |  | 1,624.8 |  |  |  |  | 1,625.6 |  |  |
Less: current portion |  |  | 2.0 |  |  |  |  | 2.1 |  |  |
Long-term debt, excluding current portion |  |  | $ | 1,622.8 |  |  |  |  | $ | 1,623.5 |  |  |
1 | See Note 11 for information on the fair value measurement of our long-term debt.

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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=6928386&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=6479336&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=34725769&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=6928386&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=6928386&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=6451184&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=6451184&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=6928386&loc=d3e21521-112644 + Details
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