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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Capitalized Contract Cost [Line Items]
Remaining performance obligation	$ 1,500.0	$ 1,500.0
Remaining performance obligation, percent to be recognized as revenue within one year	50.00%	50.00%
Long-term contract assets	$ 5.8	$ 5.8
Revenue recognized, previously included in deferred revenue	86.3	190.9
Amortization of costs to fulfill contracts	5.5	10.7
Cost to fulfill contract, net	76.1	76.1	$ 76.0
Sales Commissions
Capitalized Contract Cost [Line Items]
Deferred commissions	10.9	10.9	$ 11.0
Amortization of costs to fulfill contracts	$ 1.7	$ 3.4
Technology | Minimum
Capitalized Contract Cost [Line Items]
Period over which payment is generally received for contracts		30 days
Technology | Maximum
Capitalized Contract Cost [Line Items]
Period over which payment is generally received for contracts		60 days

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