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Leases - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Lease, renewal term	5 years
Sublease income	$ 1,900,000	$ 3,500,000
Lease incentive obligation	42,600,000
Minimum obligations			$ 843,100,000
Tenant improvements			75,000,000
Tenant improvement allowance reimbursement	(13,800,000)	$ 0
Operating leases, not yet commenced, value	$ 408,300,000
Minimum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term	1 year
Operating sublease, term	3 years
Operating leases, not yet commenced, term of contract	4 years
Maximum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term	15 years
Operating sublease, term	4 years
Operating leases, not yet commenced, term of contract	15 years
Line of Credit | Letter of Credit | Corporate Headquarters Lease
Lessee, Lease, Description [Line Items]
Letter of credit			$ 34,200,000.0

X

- Definition

Increase (Decrease) Tenant Improvement Allowance Reimbursement

+ References

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- Definition

Lease, Remaining Lease Term

+ References

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- Definition

Lessee, Lease, Renewal Term

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- Definition

Lessee, Operating Lease, Lease Not yet Commenced, Amount

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No definition available.

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- Definition

Lessee, Operating Lease, Tenant Improvement Reimbursement

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- Definition

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- Definition

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X

- Definition

This item represents an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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