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Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company incurs expenses and maintains balances with its affiliates in the ordinary course of business. As of March 31, 2018, and December 31, 2017 the Company had a receivable of $1.3 million and a receivable of $0.1 million to its affiliates, respectively. The Company conducts securities lending transactions with Industrial and Commercial Bank of China (“ICBC”), which is partially owned by Temasek and its affiliates. As of March 31, 2018, the Company had a securities loaned contract of $0.7 million with ICBC. The Company had a securities borrowed contract of $23.1 million and a securities loaned contract of $1.1 million outstanding with ICBC as of December 31, 2017. The Company purchases network connections services from affiliates of Level 3 Communications (“Level 3”). Temasek and its affiliates have a significant ownership interest in Level 3. For the three months ended March 31, 2018 and 2017, the Company paid $0.7 million and $0.7 million, respectively, to Level 3 for these services. The Company purchases and leases computer equipment and maintenance and support from affiliates of Dell Inc. (“Dell”). Temasek and its affiliates have a significant ownership interest in Dell. For the three months ended March 31, 2018 and 2017, the Company paid $0.6 million and $0.8 million, respectively, to Dell for these purchases and leases. The Company purchases market data and software licenses from affiliates of Markit Group Holdings Limited (“MarkIt”). Temasek and its affiliates have a significant ownership interest in MarkIt. For the three months ended March 31, 2018 , the Company paid $0.4 million to MarkIt for these services. The amount paid to MarkIt was immaterial for the three months ended March 31, 2017. The Company has held a minority interest in SBI since 2016 (See Note 11 "Financial assets and liabilities"). The Company pays exchange fees to SBI for the trading activities conducted on its proprietary trading system. The Company paid $2.3 million and $1.5 million for the three months ended March 31, 2018 and for the period since the completion of the minority interest investment to March 31, 2017, respectively. The Company makes payments to two JVs (See Note 2, “Summary of Significant Accounting Policies”) to fund the construction of the microwave communication networks, and to purchase microwave communication networks, which are recorded within communications and data processing on the condensed consolidated statements of comprehensive income. The Company made payments of $5.6 million and $0.1 million to the JVs for the three months ended March 31, 2018 and 2017, respectively.