Earnings Per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Earnings Per Share (EPS) [Abstract]
Net income attributable to MTI	$ 41.7	$ 41.6	$ 119.3	$ 96.7
Weighted average shares outstanding (in shares)	35,300,000	34,900,000	35,100,000	34,800,000
Dilutive effect of stock options and stock units (in shares)	300,000	400,000	500,000	300,000
Weighted average shares outstanding, adjusted (in shares)	35,600,000	35,300,000	35,600,000	35,100,000
Basic earnings per share attributable to MTI (in dollars per share)	$ 1.18	$ 1.19	$ 3.40	$ 2.78
Diluted earnings per share attributable to MTI (in dollars per share)	$ 1.17	$ 1.18	$ 3.35	$ 2.75
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)	184,569	10,239	184,569	10,239