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Related Party Transactions (Details) - USD ($) $ in Millions		8 Months Ended	12 Months Ended
	Apr. 21, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transactions
Payable to affiliates		$ 0.2	$ 0.2	$ 0.4
Non-qualified stock options
Related Party Transactions
Granted (in shares)			9,228,000
Non-qualified stock options \| 2015 Management Incentive Plan
Related Party Transactions
Granted (in shares)	9,228,000
Class A \| 2015 Management Incentive Plan
Related Party Transactions
Granted (in shares)		576,693
Dell
Related Party Transactions
Payments for purchases			$ 3.5	1.0	$ 1.4
Interactive data
Related Party Transactions
Payments for purchases			0.4	0.3	0.2
Sungard
Related Party Transactions
Payments for purchases			0.2	0.2	0.2
Singtel
Related Party Transactions
Payments for purchases			0.1	0.2	0.1
Son of Company's Founder and Executive Chairman
Related Party Transactions
Total compensation			$ 0.8	0.6	0.5
Son of Company's Founder and Executive Chairman \| Class A \| Non-qualified stock options \| 2015 Management Incentive Plan
Related Party Transactions
Granted (in shares)			60,000
Member of Board of Directors
Related Party Transactions
Payments to related party			$ 0.1	$ 0.1	$ 0.2
Affiliate Of Founder And Executive Chairman
Related Party Transactions
Sublease revenue			$ 0.1