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Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance as of Beginning of Period | $ 383.6 | $ 444.0 | $ 478.4
Additions | 45.6 | 35.9 | 41.4
Retirements | (41.6) | (74.2) | (95.6)
Other Changes | (6.8) | (22.1) | 19.8
Balance as of End of Period | 380.8 | 383.6 | 444.0
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance as of Beginning of Period | 33.2 | 41.8 | 32.8
Additions | 14.3 | 11.4 | 16.4
Retirements | (10.9) | (17.5) | (3.7)
Other Changes | (0.6) | (2.5) | (3.7)
Balance as of End of Period | 36.0 | 33.2 | 41.8
Allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance as of Beginning of Period | 350.4 | 402.2 | 445.6
Additions | 31.3 | 24.5 | 25.0
Retirements | (30.7) | (56.7) | (91.9)
Other Changes | (6.2) | (19.6) | 23.5
Balance as of End of Period | $ 344.8 | $ 350.4 | $ 402.2

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