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Leases | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Leases | 21. Leases The Company leases various property, plant and equipment. Terms of the leases vary, but generally require the Company to pay property taxes, insurance premiums, and maintenance costs associated with the leased property. Rental expense attributed to operating leases was $20.2 million, $23.1 million and $16.8 million in 2017, 2016 and 2015, respectively. Future minimum rental obligations under non-cancelable operating leases as of December 31, 2017 are payable as follows:
(in millions) |  |  |  |
2018 |  | $ | 18.5 |
2019 |  |  | 15.7 |
2020 |  |  | 14.8 |
2021 |  |  | 13.9 |
2022 |  |  | 12.7 |
Thereafter |  |  | 20.7 |
Total |  | $ | 96.3 |

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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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