Earnings Per Share (EPS) (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share (EPS) [Abstract]

Computation of Basic and Diluted Earnings Per Share

	Year Ended December 31,
(in millions, except per share data)	2018		2017		2016
Net income attributable to MTI	$	169.0	$	195.1	$	133.4
Weighted average shares outstanding		35.3		35.2		34.9
Dilutive effect of stock options and stock units		0.3		0.4		0.3
Weighted average shares outstanding, adjusted		35.6		35.6		35.2
Basic earnings per share attributable to MTI	$	4.79	$	5.54	$	3.82
Diluted earnings per share attributable to MTI	$	4.75	$	5.48	$	3.79