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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | $ 33.6 | $ 33.5 | $ 23.0
Charged to cost and expenses | 8.5 | 1.2 | 13.0
Additions (Deductions) | 2.7 | (1.1) | (2.5)
Balance at end of period | 44.8 | 33.6 | 33.5
Valuation allowance on deferred tax assets |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 35.2 | 34.7 | 39.6
Charged to cost and expenses | 3.8 | 0.2 | (3.8)
Additions (Deductions) | 1.1 | 0.3 | (1.1)
Balance at end of period | $ 40.1 | $ 35.2 | $ 34.7

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