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Segment Data - Segment Information by Geographical Region (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services | $ 4,953.9 | $ 4,972.5 | $ 4,861.3 | $ 4,542.2 | $ 5,121.1 | $ 5,416.0 | $ 5,321.7 | $ 4,904.0 | $ 19,329.9 | $ 20,762.8 | $ 20,250.5
Long-Lived Assets | 152.2 |  |  |  | 154.4 |  |  |  | 152.2 | 154.4 | 170.6
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 3,115.6 | 3,190.6 | 3,080.8
Long-Lived Assets | 32.3 |  |  |  | 30.2 |  |  |  | 32.3 | 30.2 | 30.6
France |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 4,684.1 | 5,378.6 | 5,313.6
Long-Lived Assets | 40.4 |  |  |  | 46.0 |  |  |  | 40.4 | 46.0 | 57.8
Italy |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 1,230.2 | 1,183.4 | 1,093.0
Long-Lived Assets | 4.7 |  |  |  | 4.7 |  |  |  | 4.7 | 4.7 | 6.5
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 2,118.4 | 2,168.6 | 1,884.5
Long-Lived Assets | 10.3 |  |  |  | 10.3 |  |  |  | 10.3 | 10.3 | 7.4
Total Foreign |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 16,214.3 | 17,572.2 | 17,169.7
Long-Lived Assets | $ 119.9 |  |  |  | $ 124.2 |  |  |  | $ 119.9 | $ 124.2 | $ 140.0

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