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Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for Doubtful Accounts |  |  |
Changes in valuation allowances and reserves |  |  |
Balance at beginning of year | $ 0.4 | $ 0.3 | $ 0.4
Charged to expense/(recovery) | 1.5 | 0.1 |
Deductions and other | (1.6) |  | (0.1)
Balance at end of year | 0.3 | 0.4 | 0.3
Valuation Allowance for Deferred Tax Assets |  |  |
Changes in valuation allowances and reserves |  |  |
Balance at beginning of year | 58.9 | 57.8 | 60.5
Charged to expense/(recovery) | (10.6) | 9.3 | 3.5
Deductions and other | 6.6 | (8.2) | (6.2)
Balance at end of year | $ 54.9 | $ 58.9 | $ 57.8

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- Definition Total of (A) allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, charged to costs and expenses and (B) recoveries of amounts due, which the entity that had previously been written off as uncollectible using allowances. + References No definition available. + 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&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 FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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