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Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease assets | $ 1,389.0 |  | $ 1,389.0 |  | $ 1,200.0 | $ 0.0
Short-term operating lease liabilities | 161.7 |  | 161.7 |  |  | 0.0
Operating lease liabilities | 1,221.3 |  | 1,221.3 |  |  | $ 0.0
Variable lease costs | $ 20.4 |  | $ 39.9 |  |  |
Weighted average remaining lease term | 10 years 2 months 12 days |  | 10 years 2 months 12 days |  |  |
Weighted average discount rate | 6.20% |  | 6.20% |  |  |
Cash paid for operating leases |  |  | $ 195.5 |  |  |
Operating lease asset obtained in exchange for operating lease liability |  |  | 252.5 |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |
Rental income | $ 296.1 | $ 271.2 | $ 538.1 | $ 503.1 |  |
Minimum |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |
Customer lease term | 28 days |  | 28 days |  |  |
Maximum |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |
Customer lease term | 1 year |  | 1 year |  |  |
Operating expense |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease costs | $ 102.6 |  | $ 197.0 |  |  |
Selling, general and administrative |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease costs | $ 2.3 |  | $ 4.4 |  |  |

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- Definition Term of lessor's operating lease, 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 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77888421&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=118952077&loc=SL77927221-108306 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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