Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Unrealized gain (loss) on available-for-sale securities, benefit (provision) $ 1.1 $ 0.6 $ (0.1)
Unrealized gain (loss) on interest rate swaps $ (1.0) $ (1.8) $ 0.0