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Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Doubtful Accounts |  |  |
Changes in valuation allowances and reserves |  |  |
Balance at beginning of year | $ 0.6 | $ 0.3 | $ 0.3
Charged to expense/(recovery) | 0.1 | 0.3 | 1.4
Deductions and other | 0.1 |  | (1.4)
Balance at end of year | 0.8 | 0.6 | 0.3
Valuation Allowance for Deferred Tax Assets |  |  |
Changes in valuation allowances and reserves |  |  |
Balance at beginning of year | 44.7 | 48.8 | 54.9
Charged to expense/(recovery) | (39.5) | (4.1) | (3.2)
Deductions and other | 1.7 | (0.0) | (2.9)
Balance at end of year | $ 6.9 | $ 44.7 | $ 48.8

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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 Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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