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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 | Dec. 31, 2015
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 1,287.3 | $ 1,983.1 | $ 3,095.1 | $ 3,099.8
Valuation Allowances and Reserves, Charged to Cost and Expense | (691.3) | (1,120.0) | (7.6) |
Valuation Allowances and Reserves, Charged to Other Accounts | (4.5) | (9.8) | 5.1 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired | 0.0 | 17.8 | 0.0 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | $ 0.0 | $ 0.0 | 2.2 |
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  |  | 0.0 | $ 7.1
Valuation Allowances and Reserves, Charged to Cost and Expense |  |  | 0.0 |
Valuation Allowances and Reserves, Charged to Other Accounts |  |  | (7.1) |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired |  |  | 0.0 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction |  |  | $ 0.0 |

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