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Geographic Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
[1]
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 Information                      
Consolidated revenue $ 564.4 [1] $ 601.3 $ 600.2 $ 612.5 $ 604.1 [2] $ 585.7 $ 570.9 $ 544.3 $ 2,378.4 $ 2,305.0 $ 2,194.6
Fixed Assets (net) 104.3       111.0       104.3 111.0 110.1
United States                      
Segment Reporting Information                      
Consolidated revenue                 1,611.7 1,571.4 1,477.5
Fixed Assets (net) 87.1       97.8       87.1 97.8 97.3
United Kingdom                      
Segment Reporting Information                      
Consolidated revenue                 628.8 587.3 566.4
Fixed Assets (net) 15.7       11.4       15.7 11.4 9.9
Other                      
Segment Reporting Information                      
Consolidated revenue                 137.9 146.3 150.7
Fixed Assets (net) $ 1.5       $ 1.8       $ 1.5 $ 1.8 $ 2.9
[1] For the year ended December 31, 2018, the Company recorded expenses to reduce the carrying value of the U.S. alternative Affiliate to zero and one of its non-U.S. alternative Affiliates accounted for under the equity method to fair value (see Note 13 for additional information).
[2] In the fourth quarter of 2017, the Company recorded a one-time net benefit from changes in U.S. tax laws (see Note 22 for additional information) and an expense to reduce the carrying value of one of its U.S. alternative Affiliates accounted for under the equity method (see Note 13 for additional information).