Geographic Information (Tables)

12 Months Ended

Dec. 31, 2020

Segments, Geographical Areas [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

$ in millions	Americas	UK	EMEA Ex UK	Asia	Total
For the year ended December 31, 2020
Total operating revenues (1)	4,541.6	632.8	645.1	326.1	6,145.6
Long-lived assets	384.0	147.6	9.1	23.1	563.8
For the year ended December 31, 2019
Total operating revenues (1)	4,290.2	819.7	698.3	309.2	6,117.4
Long-lived assets	416.0	138.5	8.2	20.8	583.5
For the year ended December 31, 2018
Total operating revenues (1)	3,245.0	977.2	815.9	276.0	5,314.1
Long-lived assets	319.4	122.8	8.1	18.4	468.7

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(1) Operating revenues reflect the geographical regions from which services are provided.