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Segment Data - Segment Information by Geographical Region (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, Revenue Reconciling Item [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
Long-Lived Assets | 150.9 |  |  |  | 160.0 |  |  |  | 150.9 | 160.0 | 161.3
United States Plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 2,590.6 | 2,608.9 | 2,758.5
Long-Lived Assets | 20.5 |  |  |  | 22.4 |  |  |  | 20.5 | 22.4 | 24.9
France |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 5,479.6 | 5,846.4 | 5,493.9
Long-Lived Assets | 46.9 |  |  |  | 50.1 |  |  |  | 46.9 | 50.1 | 49.1
Italy |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 1,508.3 | 1,673.9 | 1,479.4
Long-Lived Assets | 5.2 |  |  |  | 5.0 |  |  |  | 5.2 | 5.0 | 4.9
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 1,598.6 | 1,672.1 | 1,619.2
Long-Lived Assets | 5.8 |  |  |  | 7.0 |  |  |  | 5.8 | 7.0 | 9.1
Total Foreign |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 18,272.9 | 19,382.3 | 18,275.8
Long-Lived Assets | $ 130.4 |  |  |  | $ 137.6 |  |  |  | $ 130.4 | $ 137.6 | $ 136.4

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