Effect of New Accounting Pronouncements	12 Months Ended
Effect of New Accounting Pronouncements	Dec. 31, 2019
Accounting Changes and Error Corrections [Abstract]
Effect of New Accounting Pronouncements	2. Effect of New Accounting Pronouncements Revenue Recognition In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, (Topic 606), which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principal of the new accounting guidance is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. We adopted Topic 606 as of January 1, 2018, using the full retrospective method to restate each prior reporting period presented. The cumulative effect of the adoption was recognized as an increase to retained earnings of $ 125.3 million on January 1, 2016. The impact of the adoption of the new guidance resulted in changes to our accounting policies for revenue recognition, trade and other receivables, and deferred revenues as detailed in Note 4 to these consolidated financial statements. In implementing the full retrospective method of adoption, we applied the practical expedient, as defined in Topic 606, of using the benefit of hindsight to recognize contingent revenues (i.e., variable consideration) in 2017 and 2016. Leases In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). Under this new accounting guidance, an entity is required to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. Topic 842 was subsequently amended by various standards, including ASU No. 2018-10, Codification Improvements to Topic 842, Leases; and ASU No. 2018-11, Targeted Improvements. This new guidance offers specific accounting guidance for a lessee, a lessor and sale and leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. This new guidance is effective for first quarter 2019, and requires a modified retrospective adoption, applying the new standard to all leases existing at the date of initial application, with early adoption permitted. An entity may choose to use the standard’s effective date, rather than the beginning of the earliest comparative period presented, as the date of initial application. An entity would record the effects of initially applying the new guidance as a cumulative-effect adjustment to retained earnings. Consequently, an entity’s reporting for the comparative periods presented in the year of adoption would continue to be in accordance with the current guidance, including the current disclosure requirements. We adopted ASC Topic 842 for all leases effective January 1, 2019, using the modified retrospective approach allowing us to initially apply the new lease standard at the adoption date and recognize a cumulative effect adjustment to the opening balance of retained earnings in the first quarter of 2019. Consequently, the reporting for the comparative prior year periods presented in 2019 will continue to be in accordance with the previous lease guidance under ASC Topic 840, including comparative disclosure requirements. We elected the package of practical expedients to carry forward historical identification and classification of leases that commenced before January 1, 2019 and to not re-assess initial direct costs for leases commencing before January 1, 2019. We also elected the lessee practical expedient, by class of underlying asset (e.g., office space), to not separate non-lease components such as lessor-provided maintenance and property management services from the associated lease component. The new lease accounting standard requires us to recognize lease right-of-use assets and lease liabilities on our balance sheet, which are established at the inception of a lease by computing a net present value of the future lease payments. Right-of-use assets are amortized to expense, and the discount amount related to lease liabilities is accreted to expense, over the lease term. The amortization of the right-of-use asset is calculated as the difference between the straight-line lease expense and the interest calculated on the lease liability. Rent payments are applied against the lease liabilities. Adoption of the new standard resulted in the recording of net right-of-use assets and lease liabilities of approximately $379.6 million and $420.3 million, respectively, and the reclassification of net rent related assets and liabilities of $38.3 million as of January 1, 2019. The difference between the additional lease assets and lease liabilities, net of the deferred tax impact, was recorded as a decrease to beginning retained earnings of $2.4 million. The adoption of the new standard had a de minimis impact on our consolidated statement of earnings and had no impact on our consolidated statement of cash flows. See Note 15 and 17 to these 2019 consolidated financial statements for details on our current lease arrangements, the amounts of which represent the future undiscounted commitments. Income Taxes In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. This new accounting guidance allows entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Current guidance does not allow recognition until the asset has been sold to an outside party. This new guidance was effective beginning January 1, 2018 and was to be applied on a modified retrospective basis. We adopted this new guidance effective January 1, 2018 and it did not have a material impact on our consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of tax effects stranded in Accumulated Other Comprehensive Income (AOCI). This new guidance gives entities the option to reclassify to retained earnings stranded tax effects related to the change in federal tax rate for all items accounted for in other comprehensive earnings (OCI). These entities can also elect to reclassify other stranded tax effects that relate to the Tax Cuts and Jobs Act (which we refer to as the Tax Act) but do not directly relate to the change in the federal rate (e.g., state taxes or changing from a worldwide tax system to a territorial system). Tax effects that are stranded in OCI for other reasons (e.g., prior changes in tax law or a change in valuation allowance) cannot be reclassified. All entities are required to make new disclosures, regardless of whether they elect to reclassify stranded amounts. Entities are required to disclose whether or not they elected to reclassify the tax effects related to the Tax Act as well as their policy for releasing income tax effects from accumulated OCI. Under Topic 740-10-45-15, the effects of changes in tax rates and laws on deferred tax balances are recorded as a component of tax expense related to continuing operations for the period in which the law was enacted, even if the assets and liabilities related to items of accumulated OCI. The enactment of the Tax Act on December 22, 2017 resulted in stakeholder concerns about this accounting treatment. The new guidance is effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted for reporting periods, including interim periods, for which financial statements have not yet been issued or made available for issuance. An entity will be able to choose whether to apply the guidance retrospectively to each period in which the effect of the Tax Act is recognized or to apply the guidance in the period of adoption. We adopted this new guidance effective January 1, 2018, which resulted in a $6.6 million increase in retained earnings and a corresponding decrease in accumulated other comprehensive earnings (loss). This reclassification relates to the income tax effects of lowering the corporate income tax rate from 35.0% to 21.0% on deferred income taxes established on pension plan liabilities and the fair value of derivative instruments. after December 15, 2017, including interim periods within those periods, which we adopted effective January 1, 2018. The adoption of this new guidance did not have a material impact on our consolidated financial statements. Credit Impairment In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Under the new guidance an entity is required to measure all credit losses on certain financial instruments, including trade receivables and various off-balance sheet credit exposures, using an expected credit loss model. This model incorporates past experience, current conditions and reasonable and supportable forecasts affecting collectability of these instruments. An entity will apply the new guidance through a cumulative-effect adjustment to retained earnings as of the beginning of the year of adoption. The guidance is effective January 1, 2020, with early adoption permitted. We do not expect adoption of this standard will have a material impact on our consolidated financial statements as we adopt the new standard in first quarter 2020. Disclosure Framework In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This new guidance modifies various disclosure requirements for fair value measurements, including in certain part those related to Level 3 fair value measurements. The new guidance is effective January 1, 2020, with early adoption permitted. Certain portions of the guidance must be adopted prospectively while others must be adopted retrospectively to all periods presented. In August 2018, the FASB also issued ASU No. 2018-14, Compensation-Retirement Benefits-Defined Benefit Plans-General (Topic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans. This new guidance modifies various disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The new guidance is effective January 1, 2020, with early adoption permitted. Retrospective adoption is required. We do not expect adoption of either standard will have a material impact on our consolidated financial statements. Hedge Accounting In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The new guidance amends the hedge accounting model in the current guidance to enable entities to better portray the economics of their risk management activities in the financial statements and enhance the transparency and understandability of hedge results. The new guidance requires revised tabular disclosures that focus on the effect of hedge accounting by income statement line and the disclosure of the cumulative basis adjustments to the hedged assets and liabilities in fair value hedges. Certain additional disclosures are also required for hedge relationships designated under the last-of-layer method. The current guidance that requires entities to disclose hedge ineffectiveness has been eliminated because this amount will no longer be separately measured. Under the new guidance, entities will apply the amendments to cash flow and net investment hedge relationships that exist on the date of adoption using a modified retrospective approach (i.e., with a cumulative effect adjustment recorded to the opening balance of retained earnings as of the initial application date). The new guidance also provides transition relief to make it easier for entities to apply certain amendments to existing hedges (including fair value hedges) where the hedge documentation needs to be modified. The presentation and disclosure requirements will be applied prospectively. We adopted ASU 2017-12 on January 1, 2019. In accordance with the transition provisions of ASU 2017-12, we modified the recognition model for the excluded component from a mark-to-market approach to an amortization approach for our cash flow hedges with forward points existing as of the adoption date. The cumulative-effect related to this change resulted in an adjustment of $ 0.2 million that reduced accumulated other comprehensive income with a corresponding adjustment that increased retained earnings. See Note 16 for disclosures relating to our derivative and hedging activities. Intangibles - Goodwill and Other In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new guidance eliminates Step 2 of the goodwill impairment test. Instead, the updated guidance requires an entity to perform its annual or interim goodwill impairment test by comparing the fair value of the reporting unit to its carrying value, and recognizing a non-cash impairment charge for the amount by which the carrying value exceeds the reporting unit’s fair value with the loss not exceeding the total amount of goodwill allocated to that reporting unit. The new guidance is effective beginning January 1, 2020, with early adoption permitted, and will be applied on a prospective basis. The new guidance currently has no impact on our consolidated financial statements and we do not expect a significant impact on the future annual or interim goodwill impairment tests performed as we adopt the new guidance in first quarter 2020. Internal-use Software In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This new accounting guidance requires deferral of certain implementation costs associated with a cloud computing arrangement, or hosting arrangement, thereby aligning deferral of such costs with implementation costs associated with developing internal-use software. Accounting for the service component of a hosting arrangement remains unchanged. An entity will defer these implementation costs over the term of the hosting arrangement, including optional renewal periods that are reasonably certain of exercise. Amounts expensed would be presented through operating expense, rather than depreciation or amortization. The new guidance is effective January 1, 2020, with early adoption permitted. An entity may adopt the guidance either prospectively for all cloud computing arrangement implementation costs incurred on or after the effective date or retrospectively, including comparative periods. We are currently assessing the impact that adopting this guidance will have on our consolidated financial statements.