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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Feb. 07, 2019
Treasury Stock Repurchase Programs [Line Items] |  |  |
Additional share repurchase amount authorized |  | $ 602.9 |
Remaining common stock available for repurchase | $ 716.1 | $ 716.1 | $ 397.1
Common stock, held in treasury | 234.4 | 234.4 |
Common stock repurchased | $ 9,800.0 | $ 9,800.0 |
Share Buyback Program [Member] |  |  |
Treasury Stock Repurchase Programs [Line Items] |  |  |
Common stock authorized to repurchase |  |  | $ 1,000.0
Common stock repurchase, share | 0.9 | 1.9 |
Average stock price | $ 195.27 | $ 182.10 |
Aggregate cost of share | $ 175.0 | $ 349.9 |
Restricted Stock Units [Member] |  |  |
Treasury Stock Repurchase Programs [Line Items] |  |  |
Common stock repurchase, share |  | 0.2 |
Average stock price |  | $ 177.41 |
Aggregate cost of share |  | $ 34.6 |

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