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Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease, renewal term |  |  | 5 years |  |
Sublease income | $ 1.7 | $ 1.6 | $ 3.5 | $ 3.5 |
Minimum obligations | $ 815.9 |  | 815.9 |  | $ 842.7
Tenant improvements |  |  |  |  | $ 75.0
Tenant improvement allowance reimbursement |  |  | (16.6) | $ (28.5) |
Rent payments from sub-tenants |  |  | 28.0 |  |
Operating leases, not yet commenced, value |  |  | $ 130.6 |  |
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease, remaining lease term |  |  | 1 year |  |
Operating sublease, term |  |  | 1 year |  |
Operating leases, not yet commenced, term of contract | 5 years |  | 5 years |  |
Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease, remaining lease term |  |  | 16 years |  |
Operating sublease, term |  |  | 3 years |  |
Operating leases, not yet commenced, term of contract | 15 years |  | 15 years |  |
Corporate Headquarters Lease |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Tenant improvement allowance reimbursement |  |  | $ 14.7 |  |
Line of Credit | Letter of Credit | Corporate Headquarters Lease |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Letter of credit | $ 34.2 |  | $ 34.2 |  |

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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 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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