Stock-Based Compensation Plans - Nonqualified Stock Options, Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
2014 Stock Incentive Plan, Amended and Restated 2010 Stock Incentive Plan and Stock Incentive Plan
Stock-Based Compensation Plans - Disclosures
Option expiration period	10 years
Change in options outstanding
Options granted (in shares)	0.0	0.8	1.4
Nonqualified Stock Options
Change in options outstanding
Options outstanding at beginning of period (in shares)	6.2
Options granted (in shares)	0.0
Options exercised (in shares)	2.9
Options outstanding at end of period (in shares)	3.3	6.2
Options vested or expected to vest at end of period (in shares)	3.3
Options exercisable at end of period (in shares)	2.5
Options outstanding at beginning of period, Weighted-average exercise price (in dollars per share)	$ 51.89
Options exercised, Weighted-average exercise price (in dollars per share)	49.06
Options outstanding at end of period, Weighted-average exercise price (in dollars per share)	54.36	$ 51.89
Options vested or expected to vest at end of period, Weighted-average exercise price (in dollars per share)	54.35
Options exercisable at end of period, Weighted-average exercise price (in dollars per share)	$ 53.85
Options outstanding at end of period, Intrinsic value	$ 98.2
Options vested or expected to vest at end of period, Intrinsic value	98.1
Options exercisable at end of period, Intrinsic value	76.1
Total intrinsic value of options exercised	$ 92.0	$ 23.5	$ 3.4