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Stockholders' (Deficit) Equity (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Feb. 07, 2019 | Feb. 08, 2018 | Dec. 31, 2018
Treasury Stock Repurchase Programs [Line Items] |  |  |
Treasury Stock Shares Repurchased |  |  | 232,300,000
Additional share repurchase amount authorized | $ 602.9 | $ 585.8 |
Stock Repurchase Program, Authorized Amount | 1,000.0 | 1,000.0 |
Remaining common stock available for repurchase | $ 397.1 | $ 414.2 |
Payments for Repurchase of Common Stock |  |  | $ 9,420.0
Share Buyback Program [Member] |  |  |
Treasury Stock Repurchase Programs [Line Items] |  |  |
Remaining common stock available for repurchase |  |  | $ 463.2

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