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4. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Mar. 04, 2019
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill, Acquired During Period | $ 10.7 |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Purchase Price | 501.0 |  | $ 493.1 |
Accumulated Amortization | (361.6) |  | (360.0) |
Net Carrying Amount | 139.4 |  | 133.1 |
Amortization [Abstract] |  |  |  |
Amortization expense | 5.5 | $ 7.4 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 12.0
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Purchase Price | 87.2 |  | 88.7 |
Accumulated Amortization | (68.6) |  | (68.3) |
Net Carrying Amount | 18.6 |  | 20.4 |
Know how [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Purchase Price | 199.2 |  | 190.6 |
Accumulated Amortization | (159.1) |  | (159.8) |
Net Carrying Amount | 40.1 |  | 30.8 |
Amortization [Abstract] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | 10.7
Developed Technology Rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Purchase Price | 130.2 |  | 130.4 |
Accumulated Amortization | (87.8) |  | (86.6) |
Net Carrying Amount | 42.4 |  | 43.8 |
Licensing Agreements [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Purchase Price | 76.0 |  | 76.3 |
Accumulated Amortization | (41.6) |  | (40.9) |
Net Carrying Amount | 34.4 |  | 35.4 |
Trade Names [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Purchase Price | 3.9 |  | 3.9 |
Accumulated Amortization | (3.3) |  | (3.3) |
Net Carrying Amount | 0.6 |  | 0.6 |
Noncompete Agreements [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Purchase Price | 4.5 |  | 3.2 |
Accumulated Amortization | (1.2) |  | (1.1) |
Net Carrying Amount | $ 3.3 |  | $ 2.1 |
Amortization [Abstract] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 1.3
Minimum [Member] | Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 1 year |  | 1 year |
Minimum [Member] | Know how [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 1 year |  | 1 year |
Minimum [Member] | Developed Technology Rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 1 year |  | 1 year |
Minimum [Member] | Licensing Agreements [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 6 years |  | 7 years |
Minimum [Member] | Trade Names [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 2 years |  | 2 years |
Minimum [Member] | Noncompete Agreements [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 3 years |  | 7 years |
Minimum [Member] | Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 0 years |  | 0 years |
Maximum [Member] | Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 6 years |  | 6 years |
Maximum [Member] | Know how [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 10 years |  | 7 years |
Maximum [Member] | Developed Technology Rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 10 years |  | 10 years |
Maximum [Member] | Licensing Agreements [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 10 years |  | 11 years |
Maximum [Member] | Trade Names [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 6 years |  | 6 years |
Maximum [Member] | Noncompete Agreements [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 7 years |  | 7 years |
Maximum [Member] | Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Average Remaining Life (years) | 0 years |  | 0 years |

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