Congressional Budget Office Cost Estimate: H.R. 1862: Global Child Protection Act of 2017 [open pdf - 18KB]
"H.R. [House Bill] 1862 would broaden the coverage of current laws relating to unlawful sexual conduct with minors. As a result, the government might be able to pursue cases that it otherwise would not be able to prosecute. CBO [Congressional Budget Office] expects that the bill would apply to a relatively small number of offenders, however, so any increase in costs for law enforcement, court proceedings, or prison operations would not be significant. Any such costs would be subject to the availability of appropriated funds. Enacting the bill could affect direct spending and revenues; therefore, pay-as-you-go procedures apply."
Congressional Budget Office: http://www.cbo.gov/