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Accumulated Other Comprehensive Income, Net (Tables)
12 Months Ended
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of accumulated other comprehensive income (loss) table The following table summarizes the components of Accumulated other comprehensive income:
Years Ended December 31,
20212020
(in millions)
Net unrealized gains on investments, before taxes$76.7 $145.7 
Deferred tax expense on net unrealized gains(16.1)(30.6)
Total accumulated other comprehensive income$60.6 $115.1