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Retirement and Other Benefit Plans	12 Months Ended
Retirement and Other Benefit Plans	Dec. 31, 2018
Retirement Benefits [Abstract]
Retirement and Other Benefit Plans	Retirement and Other Benefit Plans Roper maintains four defined contribution retirement plans under the provisions of Section 401(k) of the IRC covering substantially all U.S. employees. Roper partially matches employee contributions. Costs related to all such plans were $31.2, $27.6 and $23.7 for 2018, 2017 and 2016, respectively. Roper also maintains various defined benefit retirement plans covering employees of non-U.S. and certain U.S. subsidiaries and a plan that supplements certain employees for the contribution ceiling applicable to the Section 401(k) plans. The costs and accumulated benefit obligations associated with each of these plans were not material.