Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income	$ 112.1	$ 72.7	$ 216.1	$ 131.5
Other comprehensive income:
Change in unrealized gains on investments	7.3	1.5	2.1	2.5
Less: tax provision related to change in unrealized gains on investments	1.7	0.4	0.7	0.7
Other comprehensive income	5.6	1.1	1.4	1.8
Comprehensive income	$ 117.7	$ 73.8	$ 217.5	$ 133.3