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Stockholders' (Deficit) Equity (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Feb. 08, 2018 | Feb. 09, 2017 | Dec. 31, 2017
Treasury Stock Repurchase Programs [Line Items] |  |  |
Treasury Stock Shares Repurchased |  |  | 227,600,000
Additional share repurchase amount authorized | $ 585.8 | $ 640.9 |
Common stock authorized to repurchase | 1,000.0 | 1,000.0 |
Remaining common stock available for repurchase | $ 414.2 | $ 359.1 |
Payments for Repurchase of Common Stock |  |  | $ 8,800.0
Share Buyback Program [Member] |  |  |
Treasury Stock Repurchase Programs [Line Items] |  |  |
Remaining common stock available for repurchase |  |  | $ 477.4

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