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Debt (Tables) | 6 Months Ended
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Jun. 30, 2013
Debt Instrument [Line Items] |
Schedule of Long Term Debt Instruments | The following table provides details of the carrying value of debt as of the dates indicated (in millions):
Description |  | Maturity Date |  | June 30, 2013 |  | December 31, 2012
Credit facility |  | August 22, 2016 |  | $ | 70.6 |  |  | $ | 134.0 |
4.875% senior notes |  | March 15, 2023 |  | 400.0 |  |  | — |
7.625% senior notes |  | February 1, 2017 |  | — |  |  | 150.0 |
New 4.0% Notes, $105.3 million principal amount |  | June 15, 2014 |  | 102.3 |  |  | 100.9 |
New 4.25% Notes, $97.0 million principal amount |  | December 15, 2014 |  | 93.3 |  |  | 92.1 |
Original 4.0% Notes |  | June 15, 2014 |  | 9.6 |  |  | 9.7 |
Original 4.25% Notes |  | December 15, 2014 |  | 3.0 |  |  | 3.0 |
Capital lease obligations, weighted average interest rate of 2.7% |  | In installments through March 2020 |  | 118.4 |  |  | 79.0 |
Notes payable for equipment and other debt, weighted average interest rate of 3.1% |  | In installments through May 2018 |  | 59.2 |  |  | 30.2 |
Total debt |  | $ | 856.4 |  |  | $ | 598.9 |
Less current maturities |  | (49.9 | ) |  | (52.6 | )
Long-term debt |  | $ | 806.5 |  |  | $ | 546.3 |
Schedule of Interest Expense, Net | The following table provides details of interest expense, net, classified within continuing operations for the periods indicated (in millions):
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Interest expense: |  |  |  |  |  |  |
Contractual and other interest expense | $ | 9.2 |  |  | $ | 7.1 |  |  | $ | 16.8 |  |  | $ | 13.5 |
Accretion of senior convertible note discount | 1.3 |  |  | 1.2 |  |  | 2.6 |  |  | 2.4 |
Amortization of deferred financing costs and commitment fees | 1.4 |  |  | 1.3 |  |  | 2.7 |  |  | 2.7 |
Total interest expense | $ | 11.9 |  |  | $ | 9.6 |  |  | $ | 22.1 |  |  | $ | 18.6 |
Interest income | (0.1 | ) |  | (0.1 | ) |  | (0.2 | ) |  | (0.2 | )
Interest expense, net | $ | 11.8 |  |  | $ | 9.5 |  |  | $ | 21.9 |  |  | $ | 18.4 |
Total New Senior Convertible Notes [Member] |
Debt Instrument [Line Items] |
Schedule of Convertible Notes, Carrying Amount Details | The carrying values of the debt and equity components of the New Convertible Notes as of the dates indicated are as follows (in millions):
| June 30, 2013 |  | December 31, 2012
| New 4.0% Senior Convertible Notes |  | New 4.25% Senior Convertible Notes |  | New 4.0% Senior Convertible Notes |  | New 4.25% Senior Convertible Notes
Principal amount | $ | 105.3 |  |  | $ | 97.0 |  |  | $ | 105.3 |  |  | $ | 97.0 |
Unamortized debt discount and financing costs | (3.0 | ) |  | (3.7 | ) |  | (4.4 | ) |  | (4.9 | )
Net carrying amount of debt component | $ | 102.3 |  |  | $ | 93.3 |  |  | $ | 100.9 |  |  | $ | 92.1 |
Carrying amount of equity component | $ | 8.9 |  |  | $ | 8.5 |  |  | $ | 8.9 |  |  | $ | 8.5 |
See Note 2 - Earnings Per Share for details regarding the value of the premium over the principal amount of the New Convertible Notes.

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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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: 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=6584090&loc=d3e28878-108400 Reference 3: 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 4: 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 5: 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 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 8: 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 9: 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 Reference 10: 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 11: 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 + Details
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- Definition Tabular disclosure of the detailed components of other nonoperating expenses. This disclosure may include methodology, assumptions and amounts for : (a) losses on securities (net of profits) and (b) miscellaneous income deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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