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Intangible assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Cost |  |
Intangible assets, gross | $ 822.1 | $ 822.1
Finite-lived intangible assets acquired | 10.0 |
Finite-lived intangible assets, accumulated amortization | 124.0 | 109.2
Intangible assets, net | $ 708.1 | $ 712.9
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period of intangible asset | 9 years | 9 years
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period of intangible asset | 22 years | 22 years
Products |  |
Cost |  |
Intangible assets, gross | $ 788.0 | $ 788.0
Finite-lived intangible assets acquired | 10.0 |
Finite-lived intangible assets, accumulated amortization | 96.0 | 82.2
Intangible assets, net | $ 702.0 | $ 705.8
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period of intangible asset | 8 years | 8 years
Cost |  |
Intangible assets, gross | $ 28.6 | $ 28.6
Finite-lived intangible assets, accumulated amortization | 23.8 | 23.0
Intangible assets, net | $ 4.8 | $ 5.6
Contract development and manufacturing services |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period of intangible asset | 8 years | 8 years
Cost |  |
Intangible assets, gross | $ 5.5 | $ 5.5
Finite-lived intangible assets, accumulated amortization | 4.2 | 4.0
Intangible assets, net | $ 1.3 | $ 1.5

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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