New Accounting Standards	12 Months Ended
Dec. 31, 2018
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	New Accounting Standards Adopted Accounting Standards In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers. On January 1, 2018, we adopted ASC 606 using the modified retrospective method and recorded an immaterial cumulative effect adjustment to the beginning balance of retained earnings for revenue contracts that existed at the adoption date. Under the modified retrospective method, prior year information has not been adjusted and continues to be reported under the accounting standards in effect for periods prior to the adoption date. We have not retroactively restated the existing contracts for modifications that occurred before January 1, 2018. See Note 1, "Description of Business and Summary of Significant Accounting Policies" for a description of the significant accounting policies and methods used in preparation of the Consolidated Financial Statements. See Note 4, “Revenues” for the disclosures required under ASC 606. The adoption of ASC 606 had an immaterial impact on our Consolidated Statements of Comprehensive Income and Consolidated Balance Sheets and had no impact on our Consolidated Statements of Cash Flows. In March 2018, the FASB issued ASU 2018-05, Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (SEC Update), Income Taxes (Topic 740). ASU 2018-05 provides guidance regarding the recording of tax impacts where uncertainty exists, in the period of adoption of the 2017 U.S. Tax Cuts and Jobs Act (the “2017 Tax Act”), which allowed companies to reflect provisional amounts for those specific income tax effects of the 2017 Tax Act for which the accounting under ASC Topic 740 is incomplete but for which a reasonable estimate could be determined. The Company recognized the income tax effects of the adoption of the 2017 Tax Act in its financial statements in accordance with ASU 2018-05. The Company finalized its accounting for the income tax effects of the adoption of the 2017 Tax Act in the fourth quarter of 2018 with the filing of its tax returns. There were no material changes to the provisional amounts recorded in the 2017 financial statements in connection with the 2017 Tax Act. Accounting Standards Not yet Adopted In February 2016, the FASB issued ASU 2016-02, amended in some respects by subsequent ASUs (collectively “ASC 842”), which supersedes existing lease guidance. Under ASC 842, we will be required to record right-of-use assets and corresponding lease liabilities on the balance sheet, as well as to disclose key quantitative and qualitative information about leasing arrangements. This guidance is effective on a modified retrospective basis for reporting periods beginning after December 15, 2018, with early adoption permitted. We elected to adopt ASC 842 using a modified transition approach, effective January 1, 2019. As permitted by the guidance, prior comparative periods will not be adjusted under this method. In addition, we elected the package of practical expedients available under the guidance that allows us not to reassess whether a contract contains a lease, lease classification or initial direct costs. In preparation for adoption of the standard, the Company implemented internal controls and business process changes to enable the preparation of financial information in accordance with the standard. The standard will have a material impact on our Consolidated Balance Sheet. The most significant impact will be the recognition of right-of-use assets and lease liabilities for operating leases. The Company estimates that adoption of this standard will result in recognition of additional right-of-use assets in the range of $145.0 million and $155.0 million and additional lease liabilities in the range of $210.0 million and $220.0 million on the adoption date for operating leases. We do not currently expect that the adoption of ASC 842 will have a material impact on our results of operations or cash flow presentation. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements for fair value measurements. The guidance promotes a framework to help improve the effectiveness of disclosures in the notes and is effective for annual and interim periods beginning after December 15, 2019, although early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, Internal Use Software (Subtopic 350-40): Customer's accounting for implementation costs incurred in a cloud computing arrangement that is a service contract, which requires the Company to capitalize implementation costs of a hosting arrangement that is a service contract and expense those costs over the term of the hosting arrangement. The guidance is effective for annual and interim periods beginning after December 15, 2019 although early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements.

New Accounting Standards

Adopted Accounting Standards

In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers. On January 1, 2018, we adopted ASC 606 using the modified retrospective method and recorded an immaterial cumulative effect adjustment to the beginning balance of retained earnings for revenue contracts that existed at the adoption date. Under the modified retrospective method, prior year information has not been adjusted and continues to be reported under the accounting standards in effect for periods prior to the adoption date. We have not retroactively restated the existing contracts for modifications that occurred before January 1, 2018.

See Note 1, "Description of Business and Summary of Significant Accounting Policies" for a description of the significant accounting policies and methods used in preparation of the Consolidated Financial Statements. See Note 4, “Revenues” for the disclosures required under ASC 606. The adoption of ASC 606 had an immaterial impact on our Consolidated Statements of Comprehensive Income and Consolidated Balance Sheets and had no impact on our Consolidated Statements of Cash Flows.

In March 2018, the FASB issued ASU 2018-05, Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (SEC Update), Income Taxes (Topic 740). ASU 2018-05 provides guidance regarding the recording of tax impacts where uncertainty exists, in the period of adoption of the 2017 U.S. Tax Cuts and Jobs Act (the “2017 Tax Act”), which allowed companies to reflect provisional amounts for those specific income tax effects of the 2017 Tax Act for which the accounting under ASC Topic 740 is incomplete but for which a reasonable estimate could be determined. The Company recognized the income tax effects of the adoption of the 2017 Tax Act in its financial statements in accordance with ASU 2018-05. The Company finalized its accounting for the income tax effects of the adoption of the 2017 Tax Act in the fourth quarter of 2018 with the filing of its tax returns. There were no material changes to the provisional amounts recorded in the 2017 financial statements in connection with the 2017 Tax Act.

Accounting Standards Not yet Adopted

In February 2016, the FASB issued ASU 2016-02, amended in some respects by subsequent ASUs (collectively “ASC 842”), which supersedes existing lease guidance. Under ASC 842, we will be required to record right-of-use assets and corresponding lease liabilities on the balance sheet, as well as to disclose key quantitative and qualitative information about leasing arrangements. This guidance is effective on a modified retrospective basis for reporting periods beginning after December 15, 2018, with early adoption permitted. We elected to adopt ASC 842 using a modified transition approach, effective January 1, 2019. As permitted by the guidance, prior comparative periods will not be adjusted under this method. In addition, we elected the package of practical expedients available under the guidance that allows us not to reassess whether a contract contains a lease, lease classification or initial direct costs.

In preparation for adoption of the standard, the Company implemented internal controls and business process changes to enable the preparation of financial information in accordance with the standard. The standard will have a material impact on our Consolidated Balance Sheet. The most significant impact will be the recognition of right-of-use assets and lease liabilities for operating leases. The Company estimates that adoption of this standard will result in recognition of additional right-of-use assets in the range of $145.0 million and $155.0 million and additional lease liabilities in the range of $210.0 million and $220.0 million on the adoption date for operating leases. We do not currently expect that the adoption of ASC 842 will have a material impact on our results of operations or cash flow presentation.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements for fair value measurements. The guidance promotes a framework to help improve the effectiveness of disclosures in the notes and is effective for annual and interim periods beginning after December 15, 2019, although early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15, Internal Use Software (Subtopic 350-40): Customer's accounting for implementation costs incurred in a cloud computing arrangement that is a service contract, which requires the Company to capitalize implementation costs of a hosting arrangement that is a service contract and expense those costs over the term of the hosting arrangement. The guidance is effective for annual and interim periods beginning after December 15, 2019 although early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements.