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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value Disclosures [Abstract] |
Fair Value By Balance Sheet Grouping | The estimated fair value of financial instruments at March 31, 2014 was as follows:
|  |  | Fair Value Measurements at Reporting Date Using
(In millions) | Total Carrying Amount |  | Total Estimated Fair Value |  | Quoted Prices in Active Markets for Identical Assets(Level 1) |  | Significant Observable Inputs (Level 2)
Cash and cash equivalents | $ | 837.7 |  |  | $ | 837.7 |  |  | $ | 837.7 |  |  | $ | — |
Derivative financial instruments: |  |  |  |  |  |  |
Assets | 8.9 |  |  | 8.9 |  |  | — |  |  | 8.9 |
Liabilities | 14.5 |  |  | 14.5 |  |  | — |  |  | 14.5 |
Debt | 1,946.8 |  |  | 2,102.4 |  |  | 2,058.1 |  |  | 44.3 |
The estimated fair value of financial instruments at December 31, 2013 was as follows:
|  |  | Fair Value Measurements at Reporting Date Using
(In millions) | Total Carrying Amount |  | Total Estimated Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2)
Cash and cash equivalents | $ | 1,026.8 |  |  | $ | 1,026.8 |  |  | $ | 1,026.8 |  |  | $ | — |
Derivative financial instruments: |  |  |  |  |  |  |
Assets | 4.3 |  |  | 4.3 |  |  | — |  |  | 4.3 |
Liabilities | 21.6 |  |  | 21.6 |  |  | — |  |  | 21.6 |
Debt | 1,947.3 |  |  | 2,072.6 |  |  | 2,027.8 |  |  | 44.8 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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