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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) | $ (0.1) |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 0.7 | $ 1.5 | $ 1.5
Charged to Cost and Expense |  | 0.2 | 0.1
Accounts Written off / Reductions | 0.0 | (1.0) | (0.1)
Balance at End of Year | 0.6 | 0.7 | 1.5
Deferred Tax Valuation Allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 99.7 | 161.3 | 127.4
Additions | 31.5 | 0.0 | 33.9
Accounts Written off / Reductions | 0.0 | (61.6) | 0.0
Balance at End of Year | $ 131.2 | $ 99.7 | $ 161.3

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