Shareholders' Equity (Schedule Of Share-Based Incentive Plan Grant Activity) (Details) - Options and SAR's $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	808,140
Granted (in shares) | shares	147,174
Exercised (in shares) | shares	(94,533)
Forfeited (in shares) | shares	(31,364)
Outstanding, ending balance (in shares) | shares	829,417
Exercisable, ending balance (in shares) | shares	555,236
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 92.94
Granted (in dollars per share) | $ / shares	143.24
Exercised (in dollars per share) | $ / shares	80.90
Forfeited (in dollars per share) | $ / shares	140.79
Ending balance (in dollars per share) | $ / shares	101.44
Exercisable, end of period (in dollars per share) | $ / shares	$ 84.81
Outstanding weighted average remaining contractual terms (years)	6 years
Exercisable weighted average remaining contractual term (years)	5 years
Outstanding aggregate intrinsic value | $	$ 39.6
Exercisable aggregate intrinsic value | $	$ 35.2
Employees Of Altra
Shares
Granted (in shares) | shares	32,419
Weighted Average Exercise Price
Granted (in dollars per share) | $ / shares	$ 57.64