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Supplemental Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule of Cash Flow, Supplemental Disclosures | Supplemental Cash Flow Information ($ in millions)
| For the Years Ended December 31,
| 2014 |  | 2013 |  | 2012
Interest paid | $ | 6.0 |  |  | $ | 2.5 |  |  | $ | 2.6 |
Income taxes paid | 17.6 |  |  | 69.8 |  |  | 33.7 |
| At December 31,
| 2014 |  | 2013 |  | 2012
Capital spending in accounts payable and accrued liabilities | 2.5 |  |  | 3.6 |  |  | 4.3 |
Allowance for Doubtful Accounts [Member] |
Valuation and Qualifying Accounts Disclosure [Line Items] |
Allowance for Doubtful Accounts | Analysis of Allowances for Doubtful Accounts: ($ in millions)
| For the Years Ended December 31,
| 2014 |  | 2013 |  | 2012
Allowance for doubtful accounts |  |  |  |  |
Beginning balance | $ | 0.4 |  |  | $ | 0.7 |  |  | $ | 0.7 |
Bad debt expense | 0.3 |  |  | — |  |  | 0.1 |
Write-offs and discounts | (0.4 | ) |  | (0.2 | ) |  | (0.1 | )
Currency translation | — |  |  | (0.1 | ) |  | — |
Ending balance | $ | 0.3 |  |  | $ | 0.4 |  |  | $ | 0.7 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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