Recently issued accounting standards	12 Months Ended
Recently issued accounting standards	Dec. 31, 2019
Accounting Policies [Abstract]
Recently issued accounting standards	Recently issued accounting standards In February 2016, the Financial Accounting Standards Board ("FASB") issued guidance that changes the requirements for accounting for leases. Under the new guidance, in connection with a lease as to which an entity is a lessee, the entity generally must recognize a right-to-use asset and a lease liability on the balance sheet, initially measured as the present value of lease payments under the lease. Under previous guidance, operating leases were not recognized on the balance sheet. We adopted the new standard on January 1, 2019 using a modified retrospective transition approach, which requires leases existing at, or entered into after, January 1, 2019 to be recognized and measured in the consolidated balance sheet. We recognized additional net lease assets and lease liabilities of $105.3 million and $106.6 million, respectively, upon adoption of the guidance. The difference between the additional lease assets and lease liabilities was recorded as an adjustment to the opening balance of retained earnings. Prior period amounts have not been adjusted and continue to reflect our historical accounting. Additional information and disclosures required by the new guidance are contained in Note 9. In February 2018, the FASB issued new guidance to address a narrow-scope financial reporting issue that arose as a consequence of federal tax legislation commonly referred to as the Tax Cuts and Jobs Act ("the TCJA"). Existing guidance requires that deferred tax liabilities and assets be adjusted for a change in tax laws or rates with the effect included in income from continuing operations in the reporting period that includes the enactment date. The guidance is applicable even in situations in which the related income tax effects of items in accumulated other comprehensive income were originally recognized in other comprehensive income (rather than in net income), such as amounts related to benefit plans and hedging activity. As a result, the tax effects of items within accumulated other comprehensive income (referred to as stranded tax effects) do not reflect the appropriate tax rate. The new guidance, which was effective January 1, 2019, permits reclassification of these amounts from accumulated other comprehensive income to retained earnings thereby eliminating the stranded tax effects. The new guidance also requires certain disclosures about the stranded tax effects. We elected not to reclassify stranded tax effects from accumulated other comprehensive income to retained earnings. In June 2016, the FASB issued new guidance that changes the methodology to be used to measure credit losses for certain financial instruments and financial assets, including trade receivables. Under current guidance, an entity reflects credit losses on financial assets measured on an amortized cost basis only when it is probable that losses have been incurred, generally considering only past events and current conditions in determining incurred loss. The new guidance requires the recognition of an allowance that reflects the current estimate of credit losses expected to be incurred over the life of the financial asset, based not only on historical experience and current conditions, but also on reasonable forecasts. The main objective of the new guidance is to provide financial statement users with more useful information in making decisions about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. We adopted the new guidance on a modified retrospective basis through a cumulative-effect adjustment to retained earnings on January 1, 2020. The adoption of the guidance did not have a material impact on the consolidated financial statements. In December 2019, the FASB issued new guidance that simplifies various aspects of accounting for income taxes including those related to the step-up in the tax basis of goodwill, intraperiod tax allocations and the interim period effects of changes in tax laws or rates. The new guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early adoption is permitted. The majority of the modifications under the new guidance will be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings on January 1, 2021. We are currently evaluating the impact the guidance will have on our consolidated financial statements and related disclosures. In January 2017, the FASB issued guidance to simplify the quantitative test for goodwill impairment. Under current guidance, if a reporting unit’s carrying value exceeds its fair value, the entity must determine the implied value of goodwill. This determination is made by deducting the fair value of a reporting unit’s identifiable assets and liabilities from the fair value of the reporting unit as a whole as if the reporting unit had just been acquired. Under the new guidance, a determination of the implied value of goodwill will no longer be required; a goodwill impairment will be equal to the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. We adopted this guidance on January 1, 2020 and will apply it, as applicable, to impairment testing we perform in 2020 and future years. The adoption of the guidance did not have an impact on the consolidated financial statements. From time to time, new accounting guidance issued by the FASB or other standard setting bodies is adopted as of the specified effective date or, when permitted by the guidance and as determined by us, as of an earlier date. We have assessed recently issued guidance that is not yet effective, except as noted above, and believe the new guidance that we have assessed will not have a material impact on our results of operations, cash flows or financial position.