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Schedule II (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Trade Accounts Receivable [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts and Reserves [Line Items] |  |  |  |  |  |
Balance at Beginning of Period | $ 0.9 |  | $ 0.9 |  | $ 0.9 |
Additions, Charged to Income | 1.0 |  | 1.3 |  | 1.1 |
Additions, Other Charges | 0 |  | 0 |  | 0 |
Deductions from Reserves | 0.9 | [1] | 1.3 | [1] | 1.1 | [1]
Balance at End of Period | 1.0 |  | 0.9 |  | 0.9 |
Finance Receivables - Long-Term [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts and Reserves [Line Items] |  |  |  |  |  |
Balance at Beginning of Period | 0.6 |  | 0.8 |  | 0.4 |
Additions, Charged to Income | 0 |  | 0.1 |  | 0.8 |
Additions, Other Charges | 0 |  | 0 |  | 0 |
Deductions from Reserves | 0 | [1] | 0.3 | [1] | 0.4 | [1]
Balance at End of Period | 0.6 |  | 0.6 |  | 0.8 |
Deferred Tax Assets [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts and Reserves [Line Items] |  |  |  |  |  |
Balance at Beginning of Period | 0.4 |  | 0.5 |  | 0.3 |
Additions, Charged to Income | 2.0 |  | (0.1) |  | 0.2 |
Additions, Other Charges | 0 |  | 0 |  | 0 |
Deductions from Reserves | 0 | [1] | 0 | [1] | 0 | [1]
Balance at End of Period | $ 2.4 |  | $ 0.4 |  | $ 0.5 |
[1] | Includes uncollectible accounts written off.

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: 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=6881521&loc=d3e24092-122690 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: 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=6881521&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: 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=6881521&loc=d3e24092-122690 + Details
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