CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 65.4	$ 48.5	$ 224.7
Other comprehensive income (loss):
Foreign currency translation	0.4	0.0	(3.0)
Total comprehensive income	$ 65.8	$ 48.5	$ 221.7