Stock Repurchases (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 13, 2017
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased, shares		409,317	1,491,481	2,884,126
Common stock repurchased, value		$ 202.6	$ 784.5	$ 1,471.8
Increase in number of shares authorized for repurchase					2,000,000
Number of shares authorized for repurchase		1,806,007
Open Market [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased, shares	[1]	352,062	1,467,481	2,877,060
Common stock repurchased, value	[1]	$ 175.1	$ 773.0	$ 1,469.1
Other [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased, shares	[2]	57,255	24,000	7,066
Common stock repurchased, value	[2]	$ 27.5	$ 11.5	$ 2.7

[1] Represents repurchases under authorizations by the board of directors for the repurchase of shares by us from time to time in the open market through privately negotiated transactions, through block trades, pursuant to trading plans adopted in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, or otherwise. On August 21, 2023, the board of directors authorized the repurchase of up to two million shares of our common stock in addition to the board’s prior authorizations. As of December 31, 2023, we had authorization to repurchase 1,806,007 shares of our common stock.

[2] Represents shares of common stock released to us by team members as payment of tax withholdings upon the vesting of restricted stock units and the conversion of restricted stock units to common stock.