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Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases |
11. | LEASES
We lease office space in various buildings for our own use. The terms of these non-cancelable operating leases provide for us to pay base rent and a share of operating expenses and real estate taxes in excess of defined amounts. We also lease equipment under both operating and capital lease arrangements. Minimum future lease payments (e.g., base rent for leases of office space) due in each of the next five years and thereafter, as of December 31, 2017, are presented in the below table.
($ in millions) |
2018 | $ | 173.1 |
2019 | 158.0 |
2020 | 134.6 |
2021 | 116.6 |
2022 | 87.6 |
Thereafter | 301.0 |
Total | $ | 970.9 |
The total of minimum rentals to be received in the future as sublessor under noncancelable operating subleases was $16.9 million as of December 31, 2017. Total rent expense, including office space and other rentals, was $197.3 million, $170.4 million and $141.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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