Business Combination (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Apr. 30, 2018	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combination [Abstract]
Net Sales		$ 447.5	$ 464.1	$ 464.7	$ 431.3	$ 432.1	$ 424.5	$ 414.1	$ 405.0	$ 1,807.6	$ 1,675.7	$ 1,638.0
Acquisition related transaction and integration costs										1.7	3.4	8.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill		$ 812.4				$ 779.3				812.4	$ 779.3	$ 778.7
Sivomatic [Member]
Business Combination [Abstract]
Net Sales										61.8
Total consideration transferred, net of cash acquired	$ 122.5
Additional deferred tax liability	18.8
Acquisition related transaction and integration costs										$ 1.7
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable	24.4
Inventories	15.6
Other current assets	0.6
Mineral rights	39.7
Plant, property and equipment	28.3
Goodwill	35.0
Intangible assets	26.4
Total assets acquired	170.0
Current maturity of long term debt	5.7
Accounts payable	9.0
Accrued expenses	5.6
Long term debt	5.3
Non-current deferred tax liability	19.7
Other non-current liabilities	2.2
Total liabilities assumed	47.5
Net assets acquired	122.5
Sivomatic [Member] | Previously Reported [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable	24.4
Inventories	15.6
Other current assets	0.6
Mineral rights	35.0
Plant, property and equipment	38.0
Goodwill	32.4
Intangible assets	20.0
Total assets acquired	166.0
Current maturity of long term debt	5.7
Accounts payable	9.0
Accrued expenses	5.8
Long term debt	5.1
Non-current deferred tax liability	16.2
Other non-current liabilities	0.1
Total liabilities assumed	41.9
Net assets acquired	124.1
Sivomatic [Member] | Increase/(Decrease) [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable	0.0
Inventories	0.0
Other current assets	0.0
Mineral rights	4.7
Plant, property and equipment	(9.7)
Goodwill	2.6
Intangible assets	6.4
Total assets acquired	4.0
Current maturity of long term debt	0.0
Accounts payable	0.0
Accrued expenses	(0.2)
Long term debt	0.2
Non-current deferred tax liability	3.5
Other non-current liabilities	2.1
Total liabilities assumed	5.6
Net assets acquired	$ (1.6)
Sivomatic [Member] | Trade Names [Member]
Business Combination [Abstract]
Estimated useful life of intangible assets acquired	20 years
Sivomatic [Member] | Customer Relationships [Member]
Business Combination [Abstract]
Estimated useful life of intangible assets acquired	20 years