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Business Combination (Details) € in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) Employee | Sep. 30, 2018 USD ($) | Oct. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) | Oct. 01, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | [2]
Business Combination [Abstract] |  |  |  |  |  |  |  |  |
Net Sales |  | $ 464.1 |  | $ 424.4 | $ 1,360.1 |  | $ 1,243.5 |  |
Acquisition-related costs |  | 0.3 |  | $ 0.5 | 1.7 |  | $ 2.8 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |
Goodwill |  | 808.1 | [1] |  | 808.1 | [1] |  |  | $ 779.3
Sivomatic [Member] |  |  |  |  |  |  |  |  |
Business Combination [Abstract] |  |  |  |  |  |  |  |  |
Number of employees | Employee | 115 |  |  |  |  |  |  |  |
Net Sales | € |  |  |  |  |  |  |  | € 73 |
Total consideration transferred, net of cash acquired | $ 122.5 |  |  |  |  |  |  |  |
Additional deferred tax liability | 15.0 |  |  |  |  |  |  |  |
Acquisition-related costs |  | $ 0.3 |  |  | $ 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 | 35.0 |  |  |  |  |  |  |  |
Plant, property and equipment | 38.0 |  |  |  |  |  |  |  |
Goodwill | 30.8 |  |  |  |  |  |  |  |
Intangible assets | 20.0 |  |  |  |  |  |  |  |
Total assets acquired | 164.4 |  |  |  |  |  |  |  |
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 | $ 122.5 |  |  |  |  |  |  |  |
Sivomatic [Member] | Tradenames [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Business Combination [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets acquired |  |  |  |  | 25 years |  |  |  |
Sivomatic [Member] | Tradenames [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Combination [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets acquired |  |  |  |  | 30 years |  |  |  |
Sivomatic [Member] | Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Business Combination [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets acquired |  |  |  |  | 25 years |  |  |  |
Sivomatic [Member] | Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Business Combination [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets acquired |  |  |  |  | 30 years |  |  |  |
[1] | Unaudited
[2] | Condensed from audited financial statements

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