Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income attributable to MTI	$ 84.1	$ 122.2	$ 164.4
Weighted average shares outstanding (in shares)	32,500,000	32,700,000	33,600,000
Dilutive effect of stock options and deferred restricted stock units (in shares)	100,000	100,000	200,000
Weighted average shares outstanding, adjusted (in shares)	32,600,000	32,800,000	33,800,000
Basic earnings per share attributable to MTI (in dollars per share)	$ 2.59	$ 3.74	$ 4.89
Diluted earnings per share attributable to MTI (in dollars per share)	$ 2.58	$ 3.73	$ 4.86
Stock Options [Member]
Earnings Per Share [Abstract]
Options outstanding (in shares)	1,514,462	1,363,418	1,330,002
Anti-dilutive securities not included in computation of diluted earnings per share (in shares)	917,177	754,867	510,683