Earnings Per Share and Shareholders’ Equity Transactions (Information Regarding Basic and Diluted Earnings Per Share) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Basic shares used in the calculation of earnings per share	44.1	44.0	44.0	44.3
Diluted shares used in the calculation of earnings per share	44.9	44.8	44.8	45.0
Per share effect of dilutive securities on income from continuing operations	$ (0.03)	$ (0.02)	$ (0.06)	$ (0.05)
Per share effect of dilutive securities on income from net income	$ (0.04)	$ (0.02)	$ (0.06)	$ (0.04)
Employee Stock Option
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of securities	0.4	0.4	0.4	0.3
Non-Vested Stock Grants
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of securities	0.4	0.4	0.4	0.4