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Debt and Credit Agreements Schedule of Long-term Debt Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | A summary of the carrying amounts and fair values of our long-term debt is listed below.
| Effective Interest Rate |  | December 31,
2016 |  | 2015
| Book Value |  | Fair Value 1 |  | Book Value |  | Fair Value 1
2.25% Senior Notes due 2017 (less unamortized discount and issuance costs of $0.1 and $0.5, respectively) | 2.30 | % |  | $ | 299.4 |  |  | $ | 301.4 |  |  | $ | 298.8 |  |  | $ | 299.3 |
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.7 and $1.3, respectively) | 4.13 | % |  | 247.0 |  |  | 258.4 |  |  | 246.4 |  |  | 250.9 |
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.9 and $2.5, respectively) | 4.32 | % |  | 496.6 |  |  | 503.3 |  |  | 496.0 |  |  | 484.8 |
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.8 and $3.0, respectively) | 4.24 | % |  | 496.2 |  |  | 511.6 |  |  | 495.8 |  |  | 496.4 |
Other notes payable and capitalized leases |  |  | 65.4 |  |  | 65.4 |  |  | 75.2 |  |  | 75.2 |
Total long-term debt |  |  | 1,604.6 |  |  |  |  | 1,612.2 |  |  |
Less: current portion |  |  | 323.9 |  |  |  |  | 1.9 |  |  |
Long-term debt, excluding current portion |  |  | $ | 1,280.7 |  |  |  |  | $ | 1,610.3 |  |  |
1 | See Note 10 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=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=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=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=6928386&loc=d3e21521-112644 + Details
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