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Equity Investments - NYX (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) shares
NYX |
Schedule of Equity Method Investments [Line Items] |
Investment cost | $ 91.9
Fair value as of December 31, 2017 | 90.4
Change in fair value loss (gain) | $ 1.5
NYX | Ordinary Shares |
Schedule of Equity Method Investments [Line Items] |
Number of shares issuable upon conversion (in shares) | shares | 9,174,364
NYX | Class A Preferred |
Schedule of Equity Method Investments [Line Items] |
Number of Shares (in shares) | shares | 40,000
NYX | Warrants |
Schedule of Equity Method Investments [Line Items] |
Warrants to acquire ordinary shares (in shares) | shares | 3,535,178
NYX | Level 1 | Ordinary Shares |
Schedule of Equity Method Investments [Line Items] |
Number of Shares (in shares) | shares | 39,000,000
Investment cost | $ 73.2
Fair value as of December 31, 2017 | 73.2
Change in fair value loss (gain) | 0.0
NYX | Level 2 | Class A exchangeable preferred shares, warrants and other |
Schedule of Equity Method Investments [Line Items] |
Investment cost | 18.7
Fair value as of December 31, 2017 | 17.2
Change in fair value loss (gain) | $ 1.5
NYX |
Schedule of Equity Method Investments [Line Items] |
Non-controlling interest acquired | 36.00%

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