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Segment Data - Schedule of Segment Data (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from services | $ 5,196.6 | $ 5,248.9 | $ 5,373.1 | $ 5,044.9 | $ 5,393.2 | $ 5,418.7 | $ 5,656.9 | $ 5,522.4 | $ 20,863.5 | $ 21,991.2 | $ 21,034.3
Franchise fees |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  |  |  |  |  | 18.4 | 24.1 | 23.7
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  |  |  |  |  | 4,182.3 | 4,159.3 | 4,216.4
Americas | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  |  |  |  |  | 2,507.0 | 2,522.3 | 2,659.0
Americas | United States | Franchise fees |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  |  |  |  |  | $ 14.1 | $ 15.0 | $ 14.8

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