Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Net Income Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Earnings Per Share [Abstract]
Antidilutive options excluded from computation of diluted net income per share (in shares)	100,000		100,000		100,000	100,000
Stock repurchase program, shares authorized (in shares)							650,000
Share purchased under share repurchase program (in shares)	86,667				476,667
Stock purchase program, cost of shares purchased	$ 28.6	$ 147.1		$ 137.1	$ 175.7
Stock repurchase program, average price per share (in dollars per share)	$ 329.40				$ 368.54