Other Comprehensive Loss - AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 212.5	$ 369.0
Total other comprehensive loss	$ (2.0)	$ (37.4)	(7.5)	(49.7)
Ending balance	494.6	257.4	494.6	257.4
Defined Benefit Pension and Other Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	0.1	0.2	0.4	0.5
Tax Benefit/ (Expense)	0.0	(0.1)	(0.2)	(0.2)
After-Tax Amount	0.1	0.1	0.2	0.3
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			3.0	4.0
Other comprehensive loss before reclassifications			0.0	0.5
Amounts reclassified from accumulated other comprehensive income (loss)			(1.0)	(4.3)
Total other comprehensive loss			(1.0)	(3.8)
Distribution of GCP			(0.2)
Ending balance	1.8	0.2	1.8	0.2
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	(2.3)	(32.8)	(6.4)	(44.3)
Tax Benefit/ (Expense)	0.0	0.0	0.0	0.0
After-Tax Amount	(2.3)	(32.8)	(6.4)	(44.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(66.1)	(22.8)
Other comprehensive loss before reclassifications			(6.4)	(44.3)
Amounts reclassified from accumulated other comprehensive income (loss)			0.0	0.0
Total other comprehensive loss			(6.4)	(44.3)
Distribution of GCP			135.5
Ending balance	63.0	(67.1)	63.0	(67.1)
Gain (loss) from Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	0.9	(2.1)	(4.2)	(2.5)
Tax Benefit/ (Expense)	(0.3)	0.7	1.5	0.8
After-Tax Amount	0.6	(1.4)	(2.7)	(1.7)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(3.7)	(5.0)
Other comprehensive loss before reclassifications			(4.3)	(0.9)
Amounts reclassified from accumulated other comprehensive income (loss)			1.6	(0.8)
Total other comprehensive loss			(2.7)	(1.7)
Distribution of GCP			0.0
Ending balance	(6.4)	(6.7)	(6.4)	(6.7)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	(1.9)	(38.8)	(12.1)	(52.6)
Tax Benefit/ (Expense)	(0.1)	2.0	2.0	2.8
After-Tax Amount	(2.0)	(36.8)	(10.1)	(49.8)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(66.8)	(23.8)
Other comprehensive loss before reclassifications			(10.7)	(44.7)
Amounts reclassified from accumulated other comprehensive income (loss)			0.6	(5.1)
Total other comprehensive loss			(10.1)	(49.8)
Distribution of GCP			135.3
Ending balance	$ 58.4	$ (73.6)	$ 58.4	$ (73.6)