Year-to-date, we have increased our free cash flow by 26% as compared to last year.
Sentinel, a $6 million sales business, provides leak detection solutions mostly to the high-end residential market.
Sales of $455 million were up 18% on a reported basis and up 17% organically, driven primarily by the global economic recovery.
Foreign exchange and acquisitions combined had a favorable year-over-year impact of $5 million.
Adjusted operating profit of $66 million increased 24% and adjusted operating margin of 14.4% increased 60 basis points as volume, price and productivity more than offset the impact of supply chain challenges, logistics inflation, incremental investments, incentives and business normalization costs.
Adjusted earnings per share increased by 32% for the reasons just cited in addition to lower interest expense and reduced foreign currency transaction losses.
The adjusted effective tax rate of 26.9% is 40 basis points lower year-over-year.
For GAAP purposes, we recorded a charge of $0.9 million related to the previously announced restructuring of our Mery facility in France.
We expect approximately $1 million more will be incurred in the fourth quarter.
We anticipate another $5 million to $6 million in restructuring costs in 2022 with respect to this plant closure upon completion.
As Bob noted, year-to-date free cash flow is up 26% to $120 million as compared to the same period last year.
We expect to maintain free cash flow conversion at 100% or more of net income for the full year.
The gross and net leverage ratios at the end of September were 0.6 times and negative 0.3 times, respectively.
Our net debt to capitalization ratio at quarter end was negative 8%.
During the quarter, we purchased approximately 25,000 shares of our common stock at an investment of $4 million primarily to offset dilution.
In addition, the Americas had approximately $1 million in acquired sales.
Americas' organic sales increased 17% during the quarter, with broad growth across all of our major product categories driven by strong repair and replacement and single-family residential markets and price.
Americas' adjusted operating margin declined by 30 basis points during the quarter as gross margin expansion from price, volume and productivity was more than offset by inflation, incremental investments, incentives and business normalization costs.
Europe sales increased over 14% organically, delivering another solid quarter with expansion in both the Fluid Solutions and Drains platforms.
Europe's adjusted operating margin expanded by 420 basis points, benefiting from volume, price and productivity, which more than offset inflation, incremental investments and business normalization costs.
APMEA continued its strong performance with sales up 33% organically.
Adjusted operating margin expanded by 400 basis points in APMEA in the quarter as trade and intercompany volume and productivity more than offset inflation and business normalization costs.
Our expectation for the fourth quarter is sales should expand by 10% to 14% over the fourth quarter of 2020.
We anticipate that fourth quarter adjusted operating margin should range from 13.4% to 13.8%.
Corporate costs should approximate $11 million to $12 million for the fourth quarter.
The adjusted effective tax rate should approximate 26%.
As a reference, the average euro-dollar foreign exchange rate for the fourth quarter of 2020 was 1.19.
Please recall that for every $0.01 movement up or down in the euro-dollar exchange rate, our European annual sales are impacted by approximately $4 million, and our annual earnings per share is impacted by $0.01.
For the full year 2021, we anticipate organic growth to be 14% to 17% or about 350 basis points higher at the midpoint than our previous outlook in August.
We have raised our full year 2021 revenue outlook.

Summary:
Sales of $455 million were up 18% on a reported basis and up 17% organically, driven primarily by the global economic recovery.
We have raised our full year 2021 revenue outlook.