Restructuring Expenses and Related Asset Impairments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Restructuring expenses and related asset impairments
Severance and other employee related costs	$ 3.6	$ 2.0	$ 4.2	$ 4.9
Asset impairments and other restructuring costs	0.7	0.3	0.9	0.4
Total restructuring expenses and related asset impairments	4.3	2.3	5.1	5.3
Restructuring Liability
Balance at beginning of the period			3.0
Accruals for severance and other employee related costs			4.6
Payments			(2.3)	(4.9)
Currency translation adjustments and other			(0.1)
Balance at end of the period	5.2		5.2
Grace Construction Products
Restructuring expenses and related asset impairments
Total restructuring expenses and related asset impairments	2.8
Corporate [Member]
Restructuring expenses and related asset impairments
Total restructuring expenses and related asset impairments	$ 1.5