Other Comprehensive Loss - AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 212.5	$ 369.0
Total other comprehensive income (loss)	$ 0.6	$ 0.7	(5.5)	(12.3)
Ending balance	489.0	385.1	489.0	385.1
Defined Benefit Pension and Other Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	0.1	0.1	0.3	0.3
Tax Benefit/ (Expense)	(0.1)	0.0	(0.2)	(0.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.0	0.1	0.1	0.2
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			3.0	4.0
Other comprehensive loss before reclassifications			0.0	(0.3)
Amounts reclassified from accumulated other comprehensive income (loss)			(0.7)	(0.9)
Total other comprehensive income (loss)			(0.7)	(1.2)
Distribution of GCP			(0.2)
Ending balance	2.1	2.8	2.1	2.8
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	1.3	(0.7)	(4.1)	(11.5)
Tax Benefit/ (Expense)	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1.3	(0.7)	(4.1)	(11.5)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(66.1)	(22.8)
Other comprehensive loss before reclassifications			(4.1)	(11.5)
Amounts reclassified from accumulated other comprehensive income (loss)			0.0	0.0
Total other comprehensive income (loss)			(4.1)	(11.5)
Distribution of GCP			135.5
Ending balance	65.3	(34.3)	65.3	(34.3)
Gain (loss) from Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	(0.4)	2.5	(5.1)	(0.4)
Tax Benefit/ (Expense)	0.1	(0.9)	1.8	0.1
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(0.3)	1.6	(3.3)	(0.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(3.7)	(5.0)
Other comprehensive loss before reclassifications			(4.4)	2.2
Amounts reclassified from accumulated other comprehensive income (loss)			1.1	(2.5)
Total other comprehensive income (loss)			(3.3)	(0.3)
Distribution of GCP			0.0
Ending balance	(7.0)	(5.3)	(7.0)	(5.3)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	0.4	0.6	(10.2)	(13.8)
Tax Benefit/ (Expense)	0.2	(0.5)	2.1	0.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.6	0.1	(8.1)	(13.0)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(66.8)	(23.8)
Other comprehensive loss before reclassifications			(8.5)	(9.6)
Amounts reclassified from accumulated other comprehensive income (loss)			0.4	(3.4)
Total other comprehensive income (loss)			(8.1)	(13.0)
Distribution of GCP			135.3
Ending balance	$ 60.4	$ (36.8)	$ 60.4	$ (36.8)