Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net income	$ 104.0	$ 58.8
Other comprehensive income (loss):
Change in unrealized gains (losses) on investments	(5.2)	1.0
Less: tax provision (benefit) related to change in unrealized gains (losses) on investments	(1.0)	0.3
Other comprehensive income (loss)	(4.2)	0.7
Comprehensive income	$ 99.8	$ 59.5