Stock-based Compensation and Employee Benefit Plans

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Stock-based Compensation and Employee Benefit Plans

Stock-based Compensation and Employee Benefit Plans

We provide stock-based compensation using stock options and RSUs. At the Annual Meeting, our stockholders approved the adoption of a new ESPP. The first offering period under the new ESPP commenced on January 1, 2017. The following reflects stock-based compensation expense recognized:

	Three Months Ended
	March 31,
	2017		2016
Related to vesting of stock options	$	0.2	$	0.7
Related to vesting of RSUs	5.7		5.8
Total	$	5.9	$	6.5

We have defined benefit pension plans for our U.K.-based union employees (the "U.K. Plan") and certain Canadian-based employees (the "Canadian Plan") as well as a 401(k) plan for U.S.-based employees, which are described in Note 19 in our 2016 10-K. We recognized no material costs in 2017 and 2016 under these plans.