Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 10, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks		$ 26,089	$ 0
Fair Value of Identifiable Assets Acquired:
Goodwill		4,466,634		$ 4,070,267
FY 2018 Acquisitions
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)		347,357
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks		26,089
Total Consideration		373,446
Fair Value of Identifiable Assets Acquired:
Cash		484
Accounts Receivable and Prepaid Expenses		3,354
Property, Plant and Equipment		195,470
Customer Relationship Intangible Assets		7,254
Data Center In-Place Leases		32,091
Data Center Tenant Relationships		18,410
Data Center Above-Market Leases		2,381
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		273
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt		(19,941)
Accounts Payable, Accrued Expenses and Other Liabilities		(2,197)
Deferred Income Taxes		(31,761)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Data Center Below Market Leases		(694)
Other Liabilities		(1,176)
Total Fair Value of Identifiable Net Assets Acquired		203,948
Goodwill		169,498
Cash Acquired from Acquisition		34,711
Payments for (Proceeds from) Previous Acquisition		7,177
Series of Individually Immaterial Business Acquisitions and IODC Transaction [Member]
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)		1,694,403
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks		26,089
Total Consideration		1,720,492
Fair Value of Identifiable Assets Acquired:
Cash		34,711
Accounts Receivable and Prepaid Expenses		10,424
Property, Plant and Equipment		1,058,497
Customer Relationship Intangible Assets		7,254
Data Center In-Place Leases		136,431
Data Center Tenant Relationships		95,772
Data Center Above-Market Leases		18,820
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		273
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt		(19,941)
Accounts Payable, Accrued Expenses and Other Liabilities		(25,395)
Deferred Income Taxes		(31,761)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Data Center Below Market Leases		(12,115)
Other Liabilities		(1,176)
Total Fair Value of Identifiable Net Assets Acquired		1,271,794
Goodwill		448,698
IO Data Center LLC [Member]
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)		1,347,046
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks		0
Total Consideration	$ 1,347,000	1,347,046
Fair Value of Identifiable Assets Acquired:
Cash		34,227
Accounts Receivable and Prepaid Expenses		7,070
Property, Plant and Equipment		863,027
Customer Relationship Intangible Assets		0
Data Center In-Place Leases		104,340
Data Center Tenant Relationships		77,362
Data Center Above-Market Leases		16,439
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt		0
Accounts Payable, Accrued Expenses and Other Liabilities		(23,198)
Deferred Income Taxes		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Data Center Below Market Leases		(11,421)
Other Liabilities		0
Total Fair Value of Identifiable Net Assets Acquired		1,067,846
Goodwill		$ 279,200