Common Share Data (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares

Weighted-average shares used in computing net income per share are as follows:

(In millions)	2015	2014	2013
Weighted-average shares — basic:	87.8	92.3	95.5
Plus dilutive impact of share-based compensation	0.9	1.2	1.0
Weighted-average shares — diluted:	88.7	93.5	96.5