Common Share Data (Tables)

12 Months Ended

Dec. 31, 2014

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)	2014	2013	2012
Weighted-average shares — basic:	92.3	95.5	89.1
Plus dilutive impact of share-based compensation	1.2	1.0	0.7
Weighted-average shares — diluted:	93.5	96.5	89.8