management 2019s discussion and analysis of financial condition and results of operations 2013 ( continued ) ( amounts in millions , except per share amounts ) corporate and other expenses decreased slightly during 2012 by $ 4.7 to $ 137.3 compared to 2011 , primarily due to lower office and general expenses , partially offset by an increase in temporary help to support our information-technology system-upgrade initiatives . liquidity and capital resources cash flow overview the following tables summarize key financial data relating to our liquidity , capital resources and uses of capital. .
what portion of the change in net cash used for investing activities was used for capital expenditures in 2013?
1 reflects net income adjusted primarily for depreciation and amortization of fixed assets and intangible assets , amortization of restricted stock and other non-cash compensation , non-cash loss related to early extinguishment of debt , and deferred income taxes . 2 reflects changes in accounts receivable , expenditures billable to clients , other current assets , accounts payable and accrued liabilities . operating activities net cash provided by operating activities during 2013 was $ 592.9 , which was an increase of $ 235.7 as compared to 2012 , primarily as a result of an improvement in working capital usage of $ 283.6 , offset by a decrease in net income . due to the seasonality of our business , we typically generate cash from working capital in the second half of a year and use cash from working capital in the first half of a year , with the largest impacts in the first and fourth quarters . the improvement in working capital in 2013 was impacted by our media businesses and an ongoing focus on working capital management at our agencies . net cash provided by operating activities during 2012 was $ 357.2 , which was an increase of $ 83.7 as compared to 2011 , primarily as a result of a decrease in working capital usage of $ 66.2 . the net working capital usage in 2012 was primarily impacted by our media businesses . the timing of media buying on behalf of our clients affects our working capital and operating cash flow . in most of our businesses , our agencies enter into commitments to pay production and media costs on behalf of clients . to the extent possible we pay production and media charges after we have received funds from our clients . the amounts involved substantially exceed our revenues , and primarily affect the level of accounts receivable , expenditures billable to clients , accounts payable and accrued liabilities . our assets include both cash received and accounts receivable from clients for these pass-through arrangements , while our liabilities include amounts owed on behalf of clients to media and production suppliers . our accrued liabilities are also affected by the timing of certain other payments . for example , while annual cash incentive awards are accrued throughout the year , they are generally paid during the first quarter of the subsequent year . investing activities net cash used in investing activities during 2013 primarily relates to payments for capital expenditures and acquisitions . capital expenditures of $ 173.0 relate primarily to computer hardware and software and leasehold improvements . we made payments of $ 61.5 related to acquisitions completed during 2013. .