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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, 2020 | Jun. 30, 2020 | Feb. 06, 2020
Treasury Stock Repurchase Programs [Line Items] |  |  |
Additional share repurchase amount authorized |  | $ 743.0 |
Remaining common stock available for repurchase | $ 675.6 | $ 675.6 | $ 257.0
Common stock, held in treasury | 238.6 | 238.6 |
Common stock repurchased | $ 10,630.0 | $ 10,630.0 |
Share Buyback Program [Member] |  |  |
Treasury Stock Repurchase Programs [Line Items] |  |  |
Common stock authorized to repurchase |  |  | $ 1,000.0
Common stock repurchase, share | 0.7 | 2.0 |
Average stock price | $ 205.45 | $ 195.68 |
Aggregate cost of share | $ 150.0 | $ 395.0 |
Restricted Stock Units [Member] |  |  |
Treasury Stock Repurchase Programs [Line Items] |  |  |
Common stock repurchase, share |  | 0.2 |
Average stock price |  | $ 210.23 |
Aggregate cost of share |  | $ 34.9 |

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