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Segment Data - Segment Information by Geographical Region (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services | $ 5,393.2 | $ 5,418.7 | $ 5,656.9 | $ 5,522.4 | $ 5,637.5 | $ 5,464.8 | $ 5,174.8 | $ 4,757.2 | $ 21,991.2 | $ 21,034.3 | $ 19,654.1
Long-Lived Assets | 160.0 |  |  |  | 161.3 |  |  |  | 160.0 | 161.3 | 150.6
Franchise fees |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 24.1 | 23.7 | 23.3
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 4,159.3 | 4,216.4 | 4,297.2
Americas | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 2,522.3 | 2,659.0 | 2,836.8
Americas | United States | Franchise fees |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 15.0 | 14.8 | 15.1
Americas | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 25.6 |  |  |  | 26.7 |  |  |  | 25.6 | 26.7 | 34.0
Americas | Reportable segments | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 19.6 |  |  |  | 20.6 |  |  |  | 19.6 | 20.6 | 27.7
United States Plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 2,608.9 | 2,758.5 | 2,950.2
Long-Lived Assets | 22.4 |  |  |  | 24.9 |  |  |  | 22.4 | 24.9 | 33.9
France |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 5,846.4 | 5,493.9 | 4,857.3
Long-Lived Assets | 50.1 |  |  |  | 49.1 |  |  |  | 50.1 | 49.1 | 40.9
Italy |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 1,673.9 | 1,479.4 | 1,170.7
Long-Lived Assets | 5.0 |  |  |  | 4.9 |  |  |  | 5.0 | 4.9 | 4.4
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 1,672.1 | 1,619.2 | 1,819.7
Long-Lived Assets | 7.0 |  |  |  | 9.1 |  |  |  | 7.0 | 9.1 | 9.0
Total Foreign |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 19,382.3 | 18,275.8 | 16,703.9
Long-Lived Assets | $ 137.6 |  |  |  | $ 136.4 |  |  |  | $ 137.6 | $ 136.4 | $ 116.7

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