For the quarter, we delivered adjusted diluted net earnings per share of $0.70, an increase of 19% year-over-year as well as total revenue growth of 4.9%, which exceeded the high-end of our guidance and included a return to positive core growth.
Despite the continued challenges associated with the COVID-19 pandemic, our disciplined application of the Fortive Business System help drive more than 100 basis points of core operating margin expansion and a 39% increase in free cash flow.
The strength of our recurring revenue, which now accounts for approximately 39% of our total revenue provided an important source of stability throughout 2020.
The application of FBS customer success tools also continue to deliver improvements in net revenue retention, which climbed greater than 101% for the full year.
On January 19th, we disposed-off our remaining 19.9% ownership stake in Vontier through a tax efficient Debt-for-Equity Exchange.
With the combination of the Vontier spin proceeds, the Debt-for-Equity Exchange and our continued strong free cash flow, we have reduced our net debt by approximately $3 billion since the beginning of Q4 with a net leverage ratio currently at approximately 1.3 times, we have significant capacity to pursue key capital allocation priorities.
Adjusted net earnings were $252.9 million, up 19.3% from the prior year and adjusted diluted net earnings per share was $0.70.
Total sales increased 4.9% to $1.3 billion with core revenue up 0.7%, reflecting continued sequential improvement from the prior quarter.
Acquisitions contributed 260 basis points of growth and favorable foreign exchange rates increased growth by 160 basis points.
We are particularly pleased to deliver adjusted gross margins of 58.5%, representing a new high for Fortive, which highlights the significant portfolio transformation accomplished over the last few years.
Adjusted operating profit margin was 23.2% for the quarter.
This reflected 130 basis points of core margin, operating margin expansion, including positive core OMX for each of the segments.
This was the second consecutive quarter with greater than 100 basis points of core OMX.
The Q4 margin performance also contributed to 50 basis points of positive core OMX for the full year 2020.
During the fourth quarter, we generated $313 million of free cash flow, representing conversion of 124% of adjusted net earnings and an increase of 39% year-over-year.
Including this fourth quarter contribution, our full-year 2020 free cash flow was $902 million, representing conversion of 120% of adjusted net earnings and an increase of 44% year-over-year.
Continued strength in China was broad-based, led by mid 20% growth at Sensing, mid-teens growth at Fluke, and high-teens growth at Advanced Sterilization Products.
Intelligent Operating Solutions posted a total revenue increase of 3.2% despite a 0.3% decline in core revenue.
Acquisitions increased growth by 170 basis points while favorable foreign exchange rates increased growth by 180 basis points.
Core operating margin increased 280 basis points.
This price realization, improved mix and higher volumes of Fluke resulted in segment level adjusted operating margin of 28.7%.
Accruent also continued to apply FBS to drive improvement and churn in the quarter, bringing net retention for the year to greater than 100%.
Turning to our Precision Technologies segment, we posted a total revenue increase of 2.3% with a 0.17% increase in core revenue.
Favorable foreign exchange rates increased growth by 160 basis points.
Core operating margin increased 30 basis points, resulting in segment level adjusted operating margin of 22.2%.
Growth in mainstream oscilloscopes continues to be led by the 6 Series line of scopes, which has seen strong demand for the new 6 and 8-channel versions since they were introduced in Q3.
Sensing performed well in China with mid 20% growth, driven by gains and critical environment applications etc and increased OEM demand for Hengstler, Dynapar's factory automation offerings.
Total revenue increased 12% with a 2.6% increase in core revenue.
Acquisitions added 830 basis points to growth while favorable foreign exchange rates increased growth by 110 basis points.
Core operating margin increased 50 basis points resulting in segment level adjusted operating margin of 24.1%, up significantly versus Q3 and driven by strong margin lift at ASP, as we continue to exit the transition service agreements.
Elective procedure volumes averaged approximately 93% of pre-COVID levels across the company's major markets, but were lower than anticipated and did not see slowing -- and did see slowing toward the end of the quarter.
With additional day to closings in Q4 in early 2021, approximately 99% of ASP's global revenue is now fully under our control and off of transition service agreements.
FHS continues to see good initial momentum across the two software platforms introduced over the past 12 months.
Invetech had another strong quarter with greater than 50% growth.
Finally, Fortive employees around the world continue to support our local communities through our efforts in our annual Day of Caring with over 35,000 hours of service in 60 worldwide communities.
For the full year, we expect adjusted diluted net earnings per share to be $2.40 to $2.55, representing year-over-year growth of 15% to 22% on a continuing operations basis.
The annual guidance assumes core revenue growth of 4% to 7% and an adjusted operating profit margin of 22% to 23% and an effective tax rate of approximately 14%.
We also expect free cash conversion to be approximately 105% of adjusted net income.
We are also initiating our first quarter adjusted diluted net earnings per share guidance of $0.56 to $0.60, representing year-over-year growth of 22% to 30%.
This includes assumptions of 5% to 8% core revenue growth and adjusted operating profit margin of 21.5% to 22.5% and an effective tax rate of 14%.
We also expect free cash conversion to be approximately 75% of adjusted net income.

Summary:
For the quarter, we delivered adjusted diluted net earnings per share of $0.70, an increase of 19% year-over-year as well as total revenue growth of 4.9%, which exceeded the high-end of our guidance and included a return to positive core growth.
With the combination of the Vontier spin proceeds, the Debt-for-Equity Exchange and our continued strong free cash flow, we have reduced our net debt by approximately $3 billion since the beginning of Q4 with a net leverage ratio currently at approximately 1.3 times, we have significant capacity to pursue key capital allocation priorities.
Adjusted net earnings were $252.9 million, up 19.3% from the prior year and adjusted diluted net earnings per share was $0.70.
For the full year, we expect adjusted diluted net earnings per share to be $2.40 to $2.55, representing year-over-year growth of 15% to 22% on a continuing operations basis.
We are also initiating our first quarter adjusted diluted net earnings per share guidance of $0.56 to $0.60, representing year-over-year growth of 22% to 30%.