ESOP (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) employee shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Share-based Payment Arrangement [Abstract]
Number of employees contributing to company's ESOP | employee	42,721
Participants percentage contribution on a pretax basis only of their annual compensation (up to the lesser of)	50.00%
Percentage of matching contribution to ESOP plan by employer	100.00%
Percentage of eligible contribution plan up to which employer contributes (up to)	6.00%
Company contributions to ESOP on behalf of participating employees representing amounts authorized by employees to be withheld from their earnings on pre-tax basis	$ 224.3	$ 196.5	$ 180.5
Company's matching contributions to the ESOP	$ 133.7	$ 120.0	$ 111.9
Employee stock ownership plan common stock shares held in ESOP (in shares) | shares	20,639,085
Percentage of total voting shares outstanding held by the ESOP	7.90%