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Rental expense and commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Rental Expense and Income from Subleases | Rental expense and income from subleases for the three years ended December 31, 2017 were as follows:
Year ended December 31, | 2017 |  |  | 2016 |  |  | 2015 |
Rental expense, less income from subleases | $ | 71.7 |  |  | $ | 77.4 |  |  | $ | 80.6 |
Income from subleases | $ | 4.4 |  |  | $ | 7.8 |  |  | $ | 9.1 |
Schedule of Minimum Net Rental Commitments Under Noncancelable Operating Leases | Minimum net rental commitments under noncancelable operating leases, including idle leases, outstanding at December 31, 2017, substantially all of which relate to real properties, were as follows:
Year |
2018 | $ | 47.4 |
2019 | 41.3 |
2020 | 32.9 |
2021 | 21.5 |
2022 | 16.2 |
Thereafter | 39.4 |
Total | $ | 198.7 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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