Revenue (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Recurring revenue, percent		90.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, requirement of payment, terms		P24M
Impairment loss	$ 0	$ 0
Deferred revenue, revenue recognized		70,100,000
Capitalized contract costs, net	181,100,000	181,100,000
Capitalized contract cost, amortization	18,500,000	53,800,000
Revenue, remaining performance obligation	$ 5,700,000,000	$ 5,700,000,000
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Performance Obligation, Description of Payment Terms		30
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Performance Obligation, Description of Payment Terms		45
IBX Data Center [Member] | Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, requirement of payment, terms		P1Y
IBX Data Center [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, requirement of payment, terms		P3Y