Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Feb. 03, 2016
Tax Credit Carryforward [Line Items]
Effective tax rate (percent)	38.10%	36.00%
Change in deferred tax assets valuation allowance	$ 12.8
Separation-related charges	8.8
Tax charges related to tax law change	4.0
Federal tax deductions relating to emergency bankruptcy	$ 1,800.0
Period allowed for carryforward of operation loss	20 years
Expected income tax deductions generated from deferred payment obligation	$ 30.0
Deferred Tax Assets, Net [Abstract]
Deferred Tax Asset (Net of Liabilities)	681.2
Valuation Allowance	(21.1)
Net Deferred Tax Asset	660.1
Taxable income required to realized DTA total amount	1,700.0
Taxable income required to realize DTA per year	90.0
Federal and state deferred tax assets utilized in separation	5.0
Foreign earnings repatriated		$ 173.1
Tax expense for repatriation attributable to current earnings	1.8	19.0
United States - Federal
Deferred Tax Assets, Net [Abstract]
Deferred Tax Asset (Net of Liabilities)	589.8
Valuation Allowance	(2.2)
Net Deferred Tax Asset	587.6
United States - States
Deferred Tax Assets, Net [Abstract]
Deferred Tax Asset (Net of Liabilities)	51.3
Valuation Allowance	(16.3)
Net Deferred Tax Asset	35.0
Germany
Deferred Tax Assets, Net [Abstract]
Deferred Tax Asset (Net of Liabilities)	31.5
Valuation Allowance	0.0
Net Deferred Tax Asset	31.5
Other foreign
Deferred Tax Assets, Net [Abstract]
Deferred Tax Asset (Net of Liabilities)	8.6
Valuation Allowance	(2.6)
Net Deferred Tax Asset	$ 6.0
Grace Construction Products | Discontinued Operations, Disposed of by Sale
Deferred Tax Assets, Net [Abstract]
Deferred tax assets transferred		$ 23.2	$ 80.0