(8) LONG-TERM DEBT
On September 23, 2016, Roper entered into a five-year $2.5 billion unsecured credit facility, as amended December 2, 2016, (the “2016 Facility”) with JPMorgan Chase Bank, N.A., as administrative agent, and a syndicate of lenders, which replaced its previous $1.85 billion unsecured credit facility dated as of July 27, 2012, as amended as of October 28, 2015 (the “2012 Facility”). The 2016 Facility comprises a five year $2.5 billion revolving credit facility, which includes availability of up to $150.0 for letters of credit. Roper may also, subject to compliance with specified conditions, request term loans or additional revolving credit commitments in an aggregate amount not to exceed $500.0. At December 31, 2019, there were $0.0 of outstanding borrowings under the 2016 Facility.
The 2016 Facility contains affirmative and negative covenants which, among other things, limit Roper’s ability to incur new debt, enter into certain mergers and acquisitions, sell assets and grant liens, make restricted payments (including the payment of dividends on our common stock) and capital expenditures, or change its line of business. Roper is also subject to financial covenants which require the Company to limit its consolidated total leverage ratio and to maintain a consolidated interest coverage ratio. The most restrictive covenant is the consolidated total leverage ratio which is limited to 3.50 to 1.
The 2016 Facility provides that the consolidated total leverage ratio may be increased, no more than twice during the term of the 2016 Facility, to 4.00 to 1 for a consecutive four quarter fiscal period per increase (or, for any portion of such four quarter fiscal period in which the maximum would be 4.25 to 1). In conjunction with the Deltek acquisition in December of 2016, we increased the maximum consolidated total leverage ratio covenant to 4.25 to 1 through June 30, 2017 and 4.00 to 1 through December 31, 2017.
The Company was in compliance with its debt covenants throughout the years ended December 31, 2019 and 2018.
On August 26, 2019, the Company completed a public offering of $500.0 aggregate principal amount of 2.35% senior unsecured notes due September 15, 2024 and $700.0 aggregate principal amount of 2.95% senior unsecured notes due September 15, 2029 (the “2019 Offering”). The notes bear interest at a fixed rate and are payable semi-annually in arrears on March 15 and September 15 of each year, beginning March 15, 2020. The net proceeds were used to fund a portion of the purchase of iPipeline Holdings, Inc.
On August 28, 2018, the Company completed a public offering of $700.0 aggregate principal amount of 3.65% senior unsecured notes due September 15, 2023 and $800.0 aggregate principal amount of 4.20% senior unsecured notes due September 15, 2028 (the “2018 Offering”). The notes bear interest at a fixed rate and are payable semi-annually in arrears on March 15 and September 15 of each year, beginning March 15, 2019.
On December 19, 2016, the Company completed a public offering of $500.0 aggregate principal amount of 2.80% senior unsecured notes due December 15, 2021 and $700.0 aggregate principal amount of 3.80% senior unsecured notes due December 15, 2026. The notes bear interest at a fixed rate and are payable semi-annually in arrears on June 15 and December 15 of each year, beginning June 15, 2017.
On December 7, 2015, the Company completed a public offering of $600.0 aggregate principal amount of 3.00% senior unsecured notes due December 15, 2020 and $300.0 aggregate principal amount of 3.85% senior unsecured notes due December 15, 2025. The notes bear interest at a fixed rate and are payable semi-annually in arrears on June 15 and December 15 of each year, beginning June 15, 2016.
On November 21, 2012, the Company completed a public offering of $500.0 aggregate principal amount of 3.125% senior unsecured notes due November 15, 2022. The notes bear interest at a fixed rate and are payable semi-annually in arrears on May 15 and November 15 of each year, beginning May 15, 2013.
In September 2009, the Company completed a public offering of $500.0 aggregate principal amount of 6.25% senior unsecured notes due September 1, 2019 (the “2019 Notes”). During 2018 a portion of the net proceeds of the 2018 Offering were used to redeem all of the $500.0 of outstanding 2019 Notes. The Company incurred a debt extinguishment charge in connection with the redemption of the 2019 Notes of $15.9, which represents the make-whole premium and unamortized deferred financing costs.
Roper may redeem some or all of these notes at any time or from time to time, at 100% of their principal amount, plus a makewhole premium based on a spread to U.S. Treasury securities.
The Company’s senior notes are unsecured senior obligations of the Company and rank equally in right of payment with all of Roper’s existing and future unsecured and unsubordinated indebtedness. The notes are effectively subordinated to any of its existing and future secured indebtedness to the extent of the value of the collateral securing such indebtedness. The notes are not guaranteed by any of Roper’s subsidiaries and are effectively subordinated to all existing and future indebtedness and other liabilities of Roper’s subsidiaries.
Total debt at December 31 consisted of the following:
Table:
 | 2019 | 2018
2016 Facility | $         — | $   865.0
$600   3.000% senior notes due 2020 | 600.0 | 600.0
$500   2.800% senior notes due 2021 | 500.0 | 500.0
$500   3.125% senior notes due 2022 | 500.0 | 500.0
$700   3.650% senior notes due 2023 | 700.0 | 700.0
$500   2.350% senior notes due 2024 | 500.0 | —
$300   3.850% senior notes due 2025 | 300.0 | 300.0
$700   3.800% senior notes due 2026 | 700.0 | 700.0
$800   4.200% senior notes due 2028 | 800.0 | 800.0
$700   2.950% senior notes due 2029 | 700.0 | —
Other | 7.7 | 3.0
Less unamortized debt issuance costs | (32.4) | (26.3)
Total debt | 5,275.3 | 4,941.7
Less current portion | 602.2 | 1.5
Long-term debt | $ 4,673.1 | $ 4,940.2


Question: When did Roper enter into a five-year $2.5 billion unsecured credit facility? 
Answer: On September 23, 2016