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Defined Contribution Plan
12 Months Ended
Dec. 31, 2017
Defined Contribution Plan [Abstract]  
Defined Contribution Plan
Defined Contribution Plan

We sponsor a defined contribution 401(k) plan, which allows our U.S.-based employees to voluntarily contribute pre-tax dollars up to a maximum amount allowable by the U.S. Internal Revenue Service. In 2017, 2016, and 2015, we made matching contributions to our 401(k) plan in the United States in an amount equal to 75 cents for every dollar of an employee's contribution, up to a maximum of 7% of the employee's compensation in the pay period.

The following table summarizes our matching contributions:
(in millions)
 
2017

 
2016

 
2015

401(k) matching contributions
 
$
10.4

 
$
9.0

 
$
8.3