Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Stock-Based Compensation Expense

A summary of the Company's stock-based compensation expense is presented in the following table:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2021		2020		2021		2020
PRSU expense	$	10.3	$	65.0	$	29.6	$	66.2
Option expense	0.4		1.3		1.2		3.7
RSU/DSU expense	5.4		5.5		15.5		16.7
Total stock-based compensation expense	$	16.1	$	71.8	$	46.3	$	86.6