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Business Combination - Narrative (Details) - USD ($) $ in Millions | Oct. 01, 2018 | Jul. 31, 2018 | Dec. 11, 2017 | Dec. 29, 2018 | Sep. 29, 2018
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 2,562.9 | $ 2,533.2
Emsor |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred |  |  | $ 16.3 |  |
Purchase price withheld |  |  | $ 0.5 | 4.9 |
Period for payment of contingent consideration liabilities |  |  | 18 months |  |
Period of cumulative revenue to trigger payment of contingent consideration liability |  |  | 2 years |  |
Goodwill |  |  |  | 5.7 |
Property, plant and equipment |  |  |  | 6.0 |
Emsor | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  |  | $ 4.6 |  |
Faxitron |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred |  | $ 89.5 |  |  |
Purchase price withheld |  | $ 11.7 |  | $ 2.9 |
Period for payment of contingent consideration liabilities |  | 1 year |  |  |
Goodwill |  | $ 42.4 |  |  |
Faxitron | Developed technology |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  | $ 44.9 |  |  |
Weighted average period |  | 9 years |  |  |
Faxitron | In-process research and development |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  | $ 5.5 |  |  |
Faxitron | In-process research and development | Minimum | Discount Rate |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets, fair value (percentage) |  | 17.00% |  |  |
Faxitron | In-process research and development | Maximum | Discount Rate |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets, fair value (percentage) |  | 19.00% |  |  |
Faxitron | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  | $ 0.5 |  |  |
Weighted average period |  | 9 years |  |  |
Faxitron | Trade names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets |  | $ 2.3 |  |  |
Weighted average period |  | 7 years |  |  |
Focal Therapeutics |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred | $ 120.1 |  |  |  |
Purchase price withheld | $ 14.0 |  |  |  |
Period for payment of contingent consideration liabilities | 1 year |  |  |  |
Goodwill | $ 30.4 |  |  |  |
Focal Therapeutics | Developed technology |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets | $ 83.1 |  |  |  |
Weighted average period | 11 years |  |  |  |
Focal Therapeutics | In-process research and development |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets | $ 11.4 |  |  |  |
Focal Therapeutics | In-process research and development | Minimum | Discount Rate |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets, fair value (percentage) | 15.50% |  |  |  |
Focal Therapeutics | In-process research and development | Maximum | Discount Rate |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets, fair value (percentage) | 16.50% |  |  |  |
Focal Therapeutics | Trade names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets | $ 2.7 |  |  |  |
Weighted average period | 13 years |  |  |  |

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