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Schedule II - Valuation and Qualifying Accounts (Notes) | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts | Schedule II - Valuation and Qualifying Accounts
($ in millions) | Balance at beginning of period | Charged to costs and expenses | Deductions (1) | Balance at end of period
For the year ended December 31, 2017 |  |  |  |
Allowances deducted from assets: |  |  |  |
Deferred tax asset valuation allowance | $ | 18.7 |  | $ | 2.5 |  | $ | (0.3 | ) | $ | 20.9 |
Allowance for doubtful accounts | 0.4 |  | (0.2 | ) | 0.3 |  | 0.5 |
Total allowances deducted from assets | $ | 19.1 |  | $ | 2.3 |  | $ | — |  | $ | 21.4 |
For the year ended December 31, 2016 |  |  |  |
Allowances deducted from assets: |  |  |  |
Deferred tax asset valuation allowance | $ | 20.1 |  | $ | (1.3 | ) | $ | (0.1 | ) | $ | 18.7 |
Allowance for doubtful accounts | 0.6 |  | — |  | (0.2 | ) | 0.4 |
Total allowances deducted from assets | $ | 20.7 |  | $ | (1.3 | ) | $ | (0.3 | ) | $ | 19.1 |
For the year ended December 31, 2015 |  |  |  |
Allowances deducted from assets: |  |  |  |
Deferred tax asset valuation allowance | $ | 22.1 |  | $ | (0.3 | ) | $ | (1.7 | ) | $ | 20.1 |
Allowance for doubtful accounts | 0.9 |  | 0.1 |  | (0.4 | ) | 0.6 |
Total allowances deducted from assets | $ | 23.0 |  | $ | (0.2 | ) | $ | (2.1 | ) | $ | 20.7 |
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(1) | Includes accounts receivable written off, the write-off or write-down of valuation allowances, and translation adjustments.

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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 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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