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Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Cost |  |  |
Intangible assets, gross | $ 828.4 | $ 818.4 | $ 151.4
Finite-lived intangible assets acquired | 10.0 | 667.0 |
Finite-lived intangible assets, accumulated amortization | (86.0) | (56.8) |
Intangible assets, net | 742.4 | 761.6 |
Goodwill [Roll Forward] |  |  |
Goodwill, cost | 268.3 | 259.7 | $ 49.1
Goodwill, measurement period adjustments | 8.6 |  |
Goodwill, acquired during period |  | 210.6 |
Goodwill | $ 268.3 | $ 259.7 |
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period of intangible asset | 5 years | 5 years |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period of intangible asset | 22 years | 22 years |
IPR&D |  |  |
Indefinite-lived Intangible Assets [Roll Forward] |  |  |
Indefinite-lived intangible assets (excluding goodwill) | $ 50.0 | $ 50.0 |
Indefinite-lived intangible assets, purchase accounting adjustments | (9.0) |  |
Indefinite-lived intangible assets (excluding goodwill) | $ 41.0 | $ 50.0 |

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