Stockholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2013
Equity [Abstract]
Stock repurchase program, authorized amount (up to)					$ 8,100.0
Number of shares purchased (in shares)			723
Cost of shares repurchased during the period	$ 146.0	$ 401.0	$ 146.1	$ 1,708.0
Remaining authorized repurchase amount	$ 1,500.0		$ 1,500.0