Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Treasury shares withheld for payment of taxes, weighted average price per share (usd per share)	[1]	$ 52.17	$ 50.20	$ 54.90

[1] Treasury shares were withheld for payment of taxes, at a weighted average price per share of $52.17, $50.20 and $54.90 in 2020, 2019 and 2018, respectively.