Earnings Per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Earnings Per Share (EPS) [Abstract]
Net income attributable to MTI	$ 39.9	$ 34.6
Weighted average shares outstanding (in shares)	35,400,000	35,000,000
Dilutive effect of stock options and stock units (in shares)	300,000	600,000
Weighted average shares outstanding, adjusted (in shares)	35,700,000	35,600,000
Basic earnings per share attributable to MTI (in dollars per share)	$ 1.13	$ 0.99
Diluted earnings per share attributable to MTI (in dollars per share)	$ 1.12	$ 0.97
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities not included in the weighted average commons shares outstanding calculation (in shares)	362,443	185,104