Exit Activities - Reserve Activity (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
2013 Exit Activity [Member] | Lease Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0.1	$ 0.3	$ 1.5	$ 0.0
Charge	0.0	0.0	2.0
Cash Expenditure	(0.2)	(1.2)	(0.5)
2013 Exit Activity [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.0	0.0	1.3	0.0
Charge	0.0	0.0	1.8
Cash Expenditure	0.0	(1.3)	(0.5)
2014 Exit Activity [Member] | Lease Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.1	0.5	0.0	0.0
Charge	0.0	2.1	0.0
Cash Expenditure	(0.4)	(1.6)	0.0
2014 Exit Activity [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.4	2.3	0.0	$ 0.0
Charge	0.0	7.8	0.0
Cash Expenditure	$ (1.9)	$ (5.5)	$ 0.0