XML 77 R65.htm IDEA: XBRL DOCUMENT v3.21.2
Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Offsetting [Abstract]    
Reduction in estimated fair value of interest rate contracts in asset position $ (32.6) $ (5.6)
Reduction in estimated fair value of interest rate contracts in liability position $ (503.1) $ (806.5)