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Schedule II - Valuation Accounts and Reserves (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning balance | $ 1.6 | $ 1.6 | $ 1.6
Charged to Expense | 0.0 | 0.0 | 0.0
Deductions | 0.0 | 0.0 | 0.0
Other | 0.0 | 0.0 | 0.0
Ending balance | 1.6 | 1.6 | 1.6
Deferred tax asset valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning balance | 103.1 | 166.9 | 407.3
Charged to Expense | 3.3 | 10.9 | 3.3
Deductions | 0.0 | 0.0 | 0.0
Other | 0.0 | (74.7) | (243.7)
Ending balance | $ 106.4 | $ 103.1 | $ 166.9

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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