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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