Payroll still accounts for about 60 percent of its business, but in recent years it has built out a suite of services that include human resources, recruiting and talent management, background checks and benefits administration.

"Our goal is to be a cradle-to-grave employer services company," Capone said.

Its non-payroll business is growing at about twice the rate of the payroll business, he said, and the company would be happy to see that trend continue.

"We definitely don't want to get out of the payroll business, it's been very good to us. But we think there are opportunities to expand our revenue inside of our clients' businesses," Capone said.

One challenge for ADP is that its brand is linked so closely to payroll, in part because 40 million Americans see its name each month on their paychecks. "We're going to do much more around advertising and marketing to try to change that brand recognition," Capone said.