Earnings Per Share and Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

A reconciliation of the numerators and denominators used in the basic and diluted earnings per share ("EPS") calculation is as follows (in millions):

	Three Months Ended					Six Months Ended
	June 30, 2018		July 1, 2017			June 30, 2018		July 1, 2017
Numerator:
Net income (loss)	$	36.2	$	(69.6	)	$	117.0	$	2.0
Denominator:
Weighted average shares outstanding for basic EPS	138.1		143.3			139.5		143.3
Dilutive effect of share-based awards*	0.6		—			0.5		0.3
Weighted average shares outstanding for diluted EPS	138.7		143.3			140.0		143.6
Anti-dilutive share-based awards excluded from computation of diluted EPS	1.7		—			0.9		0.8

* In the period of a net loss, diluted shares equal basic shares.

Schedule of share-based compensation, stock options, activity

We issued shares related to the exercise and vesting of share-based compensation as follows:

Three Months Ended		Six Months Ended
June 30, 2018	July 1, 2017	June 30, 2018	July 1, 2017
74,000	31,900	127,000	46,400