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Commitments and Contingencies Schedule of Net Rent Expense (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Net Rent Expense | Net rent expense is listed in the table below.
| Years ended December 31,
| 2018 |  | 2017 |  | 2016
Gross rent expense | $ | 375.9 |  |  | $ | 371.0 |  |  | $ | 366.1 |
Third-party sublease rental income | (5.3 | ) |  | (4.6 | ) |  | (4.1 | )
Net rent expense | $ | 370.6 |  |  | $ | 366.4 |  |  | $ | 362.0 |

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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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