Business and Recent Accounting Pronouncements - (Policies)	3 Months Ended
Mar. 28, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim unaudited Consolidated Financial Statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X and in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial reporting. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of our results of operations for the interim periods reported and of our financial condition as of the date of the interim balance sheet have been included. The Consolidated Balance Sheet as of December 28, 2019 included herein was derived from the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 28, 2019 (our “2019 Annual Report”). This Quarterly Report on Form 10-Q should be read in conjunction with the annual audited Consolidated Financial Statements and accompanying notes in our 2019 Annual Report. The accounting policies used in these interim Consolidated Financial Statements are consistent with those used in the annual Consolidated Financial Statements. The presentation of these interim Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and accompanying notes.
Cost of sales	Cost of sales We record costs associated with the manufacturing of our products in cost of sales. Shipping and handling costs incurred to store, prepare and move products between production facilities or from production facilities to branch locations or storage facilities are recorded in cost of sales. Shipping and handling costs incurred to deliver products from our Water Solutions reporting segment branch locations to the end-user consumer of those products are recorded in selling, general and administrative (“SG&A”) expenses. All other costs incurred in the shipment of products from our production facilities to customer locations are reflected in cost of sales. Shipping and handling costs included in SG&A expenses were $120.0 million and $115.0 million for the three months ended March 28, 2020 and March 30, 2019, respectively. Finished goods inventory costs include the cost of direct labor and materials and the applicable share of overhead expense chargeable to production.
Allowance for Credit Losses	Allowance for Credit LossesWe estimate an allowance for credit losses based on historical loss experience, adverse situations that may affect a customer's ability to pay, current conditions, reasonable and supportable forecasts and current economic outlook. Customer demographic, such as large commercial customers as compared to small businesses or individual customers, and the customer’s geographic market are also considered when estimating credit losses. Historical loss experience was based on actual loss rates over a one year period. Additionally, we evaluate current conditions and review third-party economic forecasts on a quarterly basis to determine the impact on the allowance for credit losses. The assumptions used in determining an estimate of credit losses are inherently subjective and actual results may differ significantly from estimated reserves.
Recently adopted accounting pronouncements and Recently issued accounting pronouncements	Recently adopted accounting pronouncements Update ASU 2016-13 – Financial Instruments—Credit Losses (Topic 326), Update ASU 2019-05 – Financial Instruments—Credit Losses—Targeted Transition Relief (Topic 326) and Update ASU 2019-11 – Codification Improvements to Financial Instruments—Credit Losses (Topic 326) In June 2016, the Financial Accounting Standards Board (“FASB”) amended its guidance to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Entities will now use forward-looking information to better form their credit loss estimates. The amended guidance also requires enhanced disclosures to help financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an entity’s portfolio. In May 2019, the FASB amended the original guidance by providing an option to irrevocably elect the fair value option for certain financial instruments previously measured at amortized cost basis. In November 2019, the FASB provided additional guidance around how to report expected recoveries. For public entities, the amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. Effective December 29, 2019, we adopted the guidance in this amendment using the modified retrospective transition method. The adoption of this new standard, with the impact being the increase in allowance for doubtful accounts related to our trade accounts receivable, resulted in a cumulative-effect adjustment of $4.3 million recognized to the opening balance of retained earnings. The Company will continue to actively monitor the impact of the recent coronavirus (“COVID-19”) pandemic on expected credit losses. Update ASU 2018-13 – Fair Value Measurement (Topic 820) In August 2018, the FASB amended its guidance on disclosure requirements for fair value measurement. The update amends existing fair value measurement disclosure requirements by adding, changing, or removing certain disclosures. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. The standard also allows for early adoption of any removed or modified disclosures upon issuance of this update while delaying adoption of the additional disclosures until their effective date. We adopted the guidance in this amendment effective December 29, 2019 prospectively. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements. Update ASU 2018-15 – Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40) In August 2018, the FASB amended its guidance on a customer’s accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. This update aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This update also requires customers to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The amendments in this update are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. We adopted the guidance in this amendment effective December 29, 2019. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements. Update ASU 2019-04 – Codification Improvements to Topic 326—Financial Instruments—Credit Losses, Topic 815—Derivative and Hedging, and Topic 825—Financial Instruments In April 2019, the FASB amended its guidance to clarify and provide narrow-scope amendments for these three recent standards related to financial instruments accounting. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. We adopted the guidance in this amendment effective December 29, 2019. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements. Update ASU 2019-12 – Income Taxes—Simplifying the Accounting for Income Taxes (Topic 740) In December 2019, the FASB amended its guidance to remove certain exceptions to the general principles in Topic 740 and improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The amendments in this update are effective for fiscal years beginning after December 15, 2020, with early adoption permitted. We adopted the guidance in this amendment effective December 29, 2019. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements. Update ASU 2020-03 – Codification Improvements to Financial Instruments In March 2020, the FASB amended its guidance to clarify or improve the financial instrument topics in the existing guidance. These amendments make the guidance easier to understand and apply by eliminating inconsistencies and providing clarifications. Certain amendments in this update are effective upon issuance of this update. The remaining amendments in this update are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. We adopted the guidance in this amendment effective December 29, 2019. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements. Recently issued accounting pronouncements Update ASU 2018-14 – Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20) In August 2018, the FASB amended its guidance on disclosure requirements for defined benefit plans. The update amends existing annual disclosure requirements applicable to all employers that sponsor defined benefit pension and other postretirement plans by adding, removing, and clarifying certain disclosures. The amendments in this update are effective for fiscal years beginning after December 15, 2020, with early adoption permitted, and are to be applied on a retrospective basis to all periods presented. We are currently assessing the impact of adoption of this standard on our Consolidated Financial Statements. Update ASU 2020-04 – Reference Rate Reform (Topic 848) In March 2020, the FASB issued guidance which provides optional expedients and exceptions to account for contracts, hedging relationships and other transactions that reference LIBOR or any other reference rates expected to be discontinued because of reference rate reform. This guidance is effective as of March 12, 2020 through December 31, 2022 and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. The Company has not adopted any of the optional expedients or exceptions through March 28, 2020, but will continue to evaluate the possible adoption of any such expedients or exceptions during the effective period as circumstances evolve.
Revenue	Revenue is recognized, net of sales returns, when a customer obtains control of promised goods or services in an amount that reflects the consideration we expect to receive in exchange for those goods or services. We measure revenue based on the consideration specified in the client arrangement, and revenue is recognized when the performance obligations in the client arrangement are satisfied. A performance obligation is a contractual promise to transfer a distinct service to the customer. The transaction price of a contract is allocated to each distinct performance obligation and recognized as revenue when the customer receives the benefit of the performance obligation. Clients typically receive the benefit of our services as they are performed. Substantially all our client contracts require that we be compensated for services performed to date. This may be upon shipment of goods or upon delivery to the customer, depending on contractual terms. Shipping and handling costs paid by the customer to us are included in revenue and costs incurred by us for shipping and handling activities that are performed after a customer obtains control of the product are accounted for as fulfillment costs. In addition, we exclude from net revenue and cost of sales taxes assessed by governmental authorities on revenue-producing transactions. Although we occasionally accept returns of products from our customers, historically returns have not been material.

Business and Recent Accounting Pronouncements - (Policies)

3 Months Ended

Mar. 28, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying interim unaudited Consolidated Financial Statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X and in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial reporting. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of our results of operations for the interim periods reported and of our financial condition as of the date of the interim balance sheet have been included. The Consolidated Balance Sheet as of December 28, 2019 included herein was derived from the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 28, 2019 (our “2019 Annual Report”). This Quarterly Report on Form 10-Q should be read in conjunction with the annual audited Consolidated Financial Statements and accompanying notes in our 2019 Annual Report. The accounting policies used in these interim Consolidated Financial Statements are consistent with those used in the annual Consolidated Financial Statements.

The presentation of these interim Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and accompanying notes.

Cost of sales

We record costs associated with the manufacturing of our products in cost of sales. Shipping and handling costs incurred to store, prepare and move products between production facilities or from production facilities to branch locations or storage facilities are recorded in cost of sales. Shipping and handling costs incurred to deliver products from our Water Solutions reporting segment branch locations to the end-user consumer of those products are recorded in selling, general and administrative (“SG&A”) expenses. All other costs incurred in the shipment of products from our production facilities to customer locations are reflected in cost of sales. Shipping and handling costs included in SG&A expenses were $120.0 million and $115.0 million for the three months ended March 28, 2020 and March 30, 2019, respectively. Finished goods inventory costs include the cost of direct labor and materials and the applicable share of overhead expense chargeable to production.

Allowance for Credit Losses

Allowance for Credit LossesWe estimate an allowance for credit losses based on historical loss experience, adverse situations that may affect a customer's ability to pay, current conditions, reasonable and supportable forecasts and current economic outlook. Customer demographic, such as large commercial customers as compared to small businesses or individual customers, and the customer’s geographic market are also considered when estimating credit losses. Historical loss experience was based on actual loss rates over a one year period. Additionally, we evaluate current conditions and review third-party economic forecasts on a quarterly basis to determine the impact on the allowance for credit losses. The assumptions used in determining an estimate of credit losses are inherently subjective and actual results may differ significantly from estimated reserves.

Recently adopted accounting pronouncements and Recently issued accounting pronouncements

Recently adopted accounting pronouncements

Update ASU 2016-13 – Financial Instruments—Credit Losses (Topic 326), Update ASU 2019-05 – Financial Instruments—Credit Losses—Targeted Transition Relief (Topic 326) and Update ASU 2019-11 – Codification Improvements to Financial Instruments—Credit Losses (Topic 326)

In June 2016, the Financial Accounting Standards Board (“FASB”) amended its guidance to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Entities will now use forward-looking information to better form their credit loss estimates. The amended guidance also requires enhanced disclosures to help financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an entity’s portfolio. In May 2019, the FASB amended the original guidance by providing an option to irrevocably elect the fair value option for certain financial instruments previously measured at amortized cost basis. In November 2019, the FASB provided additional guidance around how to report expected recoveries. For public entities, the amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted.

Effective December 29, 2019, we adopted the guidance in this amendment using the modified retrospective transition method. The adoption of this new standard, with the impact being the increase in allowance for doubtful accounts related to our trade accounts receivable, resulted in a cumulative-effect adjustment of $4.3 million recognized to the opening balance of retained earnings. The Company will continue to actively monitor the impact of the recent coronavirus (“COVID-19”) pandemic on expected credit losses.

Update ASU 2018-13 – Fair Value Measurement (Topic 820)

In August 2018, the FASB amended its guidance on disclosure requirements for fair value measurement. The update amends existing fair value measurement disclosure requirements by adding, changing, or removing certain disclosures. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. The standard also allows for early adoption of any removed or modified disclosures upon issuance of this update while delaying adoption of the additional disclosures until their effective date. We adopted the guidance in this amendment effective December 29, 2019 prospectively. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements.

Update ASU 2018-15 – Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40)

In August 2018, the FASB amended its guidance on a customer’s accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. This update aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This update also requires customers to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The amendments in this update are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. We adopted the guidance in this amendment effective December 29, 2019. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements.

Update ASU 2019-04 – Codification Improvements to Topic 326—Financial Instruments—Credit Losses, Topic 815—Derivative and Hedging, and Topic 825—Financial Instruments

In April 2019, the FASB amended its guidance to clarify and provide narrow-scope amendments for these three recent standards related to financial instruments accounting. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. We adopted the guidance in this amendment effective December 29, 2019. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements.

Update ASU 2019-12 – Income Taxes—Simplifying the Accounting for Income Taxes (Topic 740)

In December 2019, the FASB amended its guidance to remove certain exceptions to the general principles in Topic 740 and improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The amendments in this update are effective for fiscal years beginning after December 15, 2020, with early adoption permitted. We adopted the guidance in this amendment effective December 29, 2019. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements.

Update ASU 2020-03 – Codification Improvements to Financial Instruments

In March 2020, the FASB amended its guidance to clarify or improve the financial instrument topics in the existing guidance. These amendments make the guidance easier to understand and apply by eliminating inconsistencies and providing clarifications. Certain amendments in this update are effective upon issuance of this update. The remaining amendments in this update are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted. We adopted the guidance in this amendment effective December 29, 2019. Adoption of the new standard did not have a material impact on our Consolidated Financial Statements.

Recently issued accounting pronouncements

Update ASU 2018-14 – Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20)

In August 2018, the FASB amended its guidance on disclosure requirements for defined benefit plans. The update amends existing annual disclosure requirements applicable to all employers that sponsor defined benefit pension and other postretirement plans by adding, removing, and clarifying certain disclosures. The amendments in this update are effective for fiscal years beginning after December 15, 2020, with early adoption permitted, and are to be applied on a retrospective basis to all periods presented. We are currently assessing the impact of adoption of this standard on our Consolidated Financial Statements.

Update ASU 2020-04 – Reference Rate Reform (Topic 848)

In March 2020, the FASB issued guidance which provides optional expedients and exceptions to account for contracts, hedging relationships and other transactions that reference LIBOR or any other reference rates expected to be discontinued because of reference rate reform. This guidance is effective as of March 12, 2020 through December 31, 2022 and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. The Company has not adopted any of the optional expedients or exceptions through March 28, 2020, but will continue to evaluate the possible adoption of any such expedients or exceptions during the effective period as circumstances evolve.

Revenue

Revenue is recognized, net of sales returns, when a customer obtains control of promised goods or services in an amount that reflects the consideration we expect to receive in exchange for those goods or services. We measure revenue based on the consideration specified in the client arrangement, and revenue is recognized when the performance obligations in the client arrangement are satisfied. A performance obligation is a contractual promise to transfer a distinct service to the customer. The transaction price of a contract is allocated to each distinct performance obligation and recognized as revenue when the customer receives the benefit of the performance obligation. Clients typically receive the benefit of our services as they are performed. Substantially all our client contracts require that we be compensated for services performed to date. This may be upon shipment of goods or upon delivery to the customer, depending on contractual terms. Shipping and handling costs paid by the customer to us are included in revenue and costs incurred by us for shipping and handling activities that are performed after a customer obtains control of the product are accounted for as fulfillment costs. In addition, we exclude from net revenue and cost of sales taxes assessed by governmental authorities on revenue-producing transactions. Although we occasionally accept returns of products from our customers, historically returns have not been material.