Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information. Accordingly, the unaudited condensed consolidated financial statements do not include all of the information and notes required by GAAP for complete financial statements. The accounting policies we follow are set forth in Note 2, “Summary of Significant Accounting Policies,” to our audited consolidated financial statements in our 2019 Form 10-K. The following notes should be read in conjunction with these policies and other disclosures in our 2019 Form 10-K. In the opinion of management, the unaudited condensed consolidated financial statements contained herein reflect all adjustments (consisting only of normal recurring adjustments, except as set forth in these notes to condensed consolidated financial statements) necessary to present fairly in all material aspects the financial position, results of operations, comprehensive income (loss), and cash flows from all periods presented. Interim results are not necessarily indicative of results for a full year.
Internally Developed Software Costs	Internally Developed Software Costs In accordance with ASC Topic 350, we capitalize costs associated with software developed or obtained for internal use when both the preliminary project stage is completed and our management has authorized further funding for the project, which it deems probable of completion. Capitalized software costs include only: (1) external direct costs of materials and services consumed in developing or obtaining the software; (2) payroll and payroll-related costs for employees who are directly associated with and who devote time to the project; and (3) interest costs incurred while developing the software. Capitalization of these costs ceases no later than the point at which the project is substantially complete and ready for its intended purpose. We do not include general and administrative costs and overhead costs in capitalizable costs. We charge research and development costs and other software maintenance costs related to software development to earnings as incurred.
Deferred Costs	Deferred Costs Deferred costs, which primarily consist of deferred sales commissions, included within Other assets on our condensed consolidated balance sheets were $108.7 million and $106.4 million as of June 30, 2020, and December 31, 2019, respectively. Amortization expense for the deferred costs was $9.1 million and $7.7 million for the three months ended June 30, 2020, and 2019, respectively, and $18.1 million and $15.4 million for the six months ended June 30, 2020, and 2019 respectively.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2018-14, “Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans,” which modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. This update removes disclosures that are no longer considered cost beneficial, adds disclosures identified as relevant, and clarifies certain specific requirements of disclosures to improve the effectiveness of disclosures in the notes to financial statements. The amendments in this update are effective for public business entities for fiscal years ending after December 15, 2020. The amendments in this update should be applied on a retrospective basis to all periods presented. The adoption of this guidance will not have a significant impact on our annual defined benefit plan and other postretirement plan disclosures. In March 2020, the FASB issued ASU No. 2020-04, “Reference Rate Reform,” which provides guidance for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments in this guidance apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The amendments in this guidance provide for an optional method in which modifications of contracts within the scope of ASC Topic 310, Receivables, and ASC Topic 470, Debt, should be accounted for by prospectively adjusting the effective interest rate, in addition to several other optional methods and exceptions. The amendments in this update are effective for all entities as of March 12, 2020, through December 31, 2022. We do not expect the adoption of this guidance to have a significant impact on our financial statements.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2020

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information. Accordingly, the unaudited condensed consolidated financial statements do not include all of the information and notes required by GAAP for complete financial statements. The accounting policies we follow are set forth in Note 2, “Summary of Significant Accounting Policies,” to our audited consolidated financial statements in our 2019 Form 10-K. The following notes should be read in conjunction with these policies and other disclosures in our 2019 Form 10-K.

In the opinion of management, the unaudited condensed consolidated financial statements contained herein reflect all adjustments (consisting only of normal recurring adjustments, except as set forth in these notes to condensed consolidated financial statements) necessary to present fairly in all material aspects the financial position, results of operations, comprehensive income (loss), and cash flows from all periods presented. Interim results are not necessarily indicative of results for a full year.

Internally Developed Software Costs

In accordance with ASC Topic 350, we capitalize costs associated with software developed or obtained for internal use when both the preliminary project stage is completed and our management has authorized further funding for the project, which it deems probable of completion. Capitalized software costs include only: (1) external direct costs of materials and services consumed in developing or obtaining the software; (2) payroll and payroll-related costs for employees who are directly associated with and who devote time to the project; and (3) interest costs incurred while developing the software. Capitalization of these costs ceases no later than the point at which the project is substantially complete and ready for its intended purpose. We do not include general and administrative costs and overhead costs in capitalizable costs. We charge research and development costs and other software maintenance costs related to software development to earnings as incurred.

Deferred Costs

Deferred costs, which primarily consist of deferred sales commissions, included within Other assets on our condensed consolidated balance sheets were $108.7 million and $106.4 million as of June 30, 2020, and December 31, 2019, respectively. Amortization expense for the deferred costs was $9.1 million and $7.7 million for the three months ended June 30, 2020, and 2019, respectively, and $18.1 million and $15.4 million for the six months ended June 30, 2020, and 2019 respectively.

Recently Issued Accounting Pronouncements

In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2018-14, “Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans,” which modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. This update removes disclosures that are no longer considered cost beneficial, adds disclosures identified as relevant, and clarifies certain specific requirements of disclosures to improve the effectiveness of disclosures in the notes to financial statements. The amendments in this update are effective for public business entities for fiscal years ending after December 15, 2020. The amendments in this update should be applied on a retrospective basis to all periods presented. The adoption of this guidance will not have a significant impact on our annual defined benefit plan and other postretirement plan disclosures.

In March 2020, the FASB issued ASU No. 2020-04, “Reference Rate Reform,” which provides guidance for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments in

this guidance apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The amendments in this guidance provide for an optional method in which modifications of contracts within the scope of ASC Topic 310, Receivables, and ASC Topic 470, Debt, should be accounted for by prospectively adjusting the effective interest rate, in addition to several other optional methods and exceptions. The amendments in this update are effective for all entities as of March 12, 2020, through December 31, 2022. We do not expect the adoption of this guidance to have a significant impact on our financial statements.