Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Equivalents and Short-term Investments [Abstract]
Short-term investments	$ 3.8	$ 2.7
Unrealized holding gains and losses on short-term bank investments	$ 0.0
Trade Accounts Receivable [Abstract]
Past due threshold for individual collectability review	90 days
Property, Plant and Equipment [Abstract]
Initial term of long term evergreen contracts	10 years
Investment in Joint Ventures [Abstract]
Equity method investment	$ 17.8
Operating Income (Loss) [Abstract]
Marketing and administrative expenses	(178.6)	(180.7)	$ (176.4)
Other deductions	$ (1.5)	(6.2)	0.8
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation	3.00%
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation	6.67%
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation	6.67%
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation	12.50%
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation	8.00%
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation	12.50%
Computer Equipment and Software-related Assets [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation	12.50%
Computer Equipment and Software-related Assets [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation	25.00%
PCC Production Facilities [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	15 years
Machinery and Equipment for Natural Stone Mining and Processing Plants and Chemical Plants [Member]
Property, Plant and Equipment [Abstract]
Estimated useful life	15 years
Accounting Standards Update 2016-02 [Member] | Minimum [Member]
Assets and Liabilities, Lessee [Abstract]
Operating lease liability current	$ 60.0
Operating lease, ROU assets	50.0
Accounting Standards Update 2016-02 [Member] | Maximum [Member]
Assets and Liabilities, Lessee [Abstract]
Operating lease liability current	65.0
Operating lease, ROU assets	$ 55.0
Accounting Standards Update 2017-07 [Member]
Operating Income (Loss) [Abstract]
Marketing and administrative expenses		(1.7)	(3.0)
Other deductions		$ 1.7	$ 3.0