Exit Activities - Reserve Activity (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Two Thousand And Eleven Exit Activity [Member] | Lease Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0.1	$ 0.3	$ 2.7	$ 0
Charge	0	0.1	3.0
Cash Expenditure	(0.2)	(2.5)	(0.3)
Two Thousand And Eleven Exit Activity [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	0.1	0
Charge	0	0	0.7
Cash Expenditure	0	(0.1)	(0.6)
Two Thousand And Twelve Exit Activity [Member] | Lease Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.1	0.6	0	0
Charge	0	0.9	0
Cash Expenditure	(0.5)	(0.3)	0
Two Thousand And Twelve Exit Activity [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0
Charge	0	0.1
Cash Expenditure	0	(0.1)
Two Thousand And Thirteen Exit Activity [Member] | Lease Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1.5	0	0	0
Charge	2.0	0	0
Cash Expenditure	(0.5)	0	0
Two Thousand And Thirteen Exit Activity [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1.3	0	0	0
Charge	1.8	0	0
Cash Expenditure	$ (0.5)	$ 0	$ 0