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Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Unamortized Intangible Assets |  |  |
Amortization expense of intangible assets | $ 6.5 | $ 5.3 |
Estimated average amortization, year one | 24.8 |  |
Estimated average amortization, year two | 24.8 |  |
Estimated average amortization, year three | 24.8 |  |
Estimated average amortization, year four | 24.8 |  |
Estimated average amortization, year five | 24.8 |  |
AMS |  |  |
Amortized Intangible Assets |  |  |
Gross Carrying Amount | 418.3 |  | $ 419.0
Accumulated Amortization | 113.6 |  | 106.9
Accumulated Impairments | 20.7 |  | 20.7
Accumulated Foreign Exchange | (0.7) |  | (2.8)
Net Carrying Amount | 284.7 |  | 294.2
AMS | Trade names |  |  |
Amortized Intangible Assets |  |  |
Accumulated Impairments | 0.1 |  | 0.1
Accumulated Foreign Exchange | (0.2) |  | (0.6)
Unamortized Intangible Assets |  |  |
Gross Carrying Amount | 20.0 |  | 20.0
Net Carrying Amount | 20.1 |  | 20.5
AMS | Customer relationships |  |  |
Amortized Intangible Assets |  |  |
Gross Carrying Amount | 339.2 |  | 339.8
Accumulated Amortization | 94.1 |  | 88.5
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | (1.1) |  | (2.9)
Net Carrying Amount | 246.2 |  | 254.2
AMS | Developed technology |  |  |
Amortized Intangible Assets |  |  |
Gross Carrying Amount | 42.0 |  | 42.1
Accumulated Amortization | 14.9 |  | 14.1
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.1 |  | (0.2)
Net Carrying Amount | 27.0 |  | 28.2
AMS | Trade names |  |  |
Amortized Intangible Assets |  |  |
Gross Carrying Amount | 32.7 |  | 32.7
Accumulated Amortization | 1.6 |  | 1.4
Accumulated Impairments | 20.7 |  | 20.7
Accumulated Foreign Exchange | 0.3 |  | 0.3
Net Carrying Amount | 10.1 |  | 10.3
AMS | Non-compete agreements |  |  |
Amortized Intangible Assets |  |  |
Gross Carrying Amount | 2.9 |  | 2.9
Accumulated Amortization | 2.4 |  | 2.4
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0
Net Carrying Amount | 0.5 |  | 0.5
AMS | Patents |  |  |
Amortized Intangible Assets |  |  |
Gross Carrying Amount | 1.5 |  | 1.5
Accumulated Amortization | 0.6 |  | 0.5
Accumulated Impairments | 0.0 |  | 0.0
Accumulated Foreign Exchange | 0.0 |  | 0.0
Net Carrying Amount | $ 0.9 |  | $ 1.0

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