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Business Combination - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2019 USD ($) | Nov. 21, 2019 USD ($) shares | Oct. 01, 2019 USD ($) | Aug. 01, 2019 USD ($) | Oct. 01, 2018 USD ($) | Jul. 31, 2018 | Dec. 11, 2017 | Nov. 30, 2019 USD ($) | Sep. 30, 2019 $ / shares | Sep. 28, 2019 USD ($) | Mar. 28, 2020 USD ($) | Mar. 30, 2019 USD ($) | Nov. 20, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 69.3 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 78.00% |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 2,563.7 | $ 2,592.0 |  |
Equity interest in acquiree, remeasurement gain |  | $ 3.2 |  |  |  |  |  |  |  |  |  |  |
Consideration related to equity method investment |  | 17.9 |  |  |  |  |  |  |  |  |  |  |
Consideration related to newly acquired shares |  |  |  |  |  |  |  | $ 12.6 |  |  |  |  |
Consideration, portion related to loan repayment |  | 30.2 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration related to fair value of noncontrolling interest |  | 8.6 |  |  |  |  |  |  |  |  |  |  |
Discount rate percentage |  |  |  |  |  |  |  |  |  |  |  | 0.120 |
Intangible assets, net |  |  |  |  |  |  |  |  |  | 1,459.8 | $ 1,328.8 |  |
Emsor |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Period of cumulative revenue to trigger payment of contingent consideration liability |  |  |  |  |  |  | 2 years |  |  |  |  |  |
Faxitron | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period |  |  |  |  |  | 9 years |  |  |  |  |  |  |
Faxitron | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period |  |  |  |  |  | 9 years |  |  |  |  |  |  |
Faxitron | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period |  |  |  |  |  | 8 years 3 months 18 days |  |  |  |  |  |  |
Focal Therapeutics |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 12.5 |  | $ 120.1 |  |  |  |  |  |  |  |
Purchase price withheld |  |  |  |  | $ 14.0 |  |  |  |  |  |  | $ 1.5 |
Period for payment of contingent consideration liabilities |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 31.1 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
SuperSonic Imagine |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | 12.6 |  | $ 18.2 |  |  |  |  |  |  |  |  |
Equity interest in acquiree, Percentage |  |  |  | 46.00% |  |  |  |  |  |  | 81.00% |  |
Goodwill |  | 22.4 |  |  |  |  |  |  |  |  |  |  |
Other assets |  | $ 6.5 |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  | 46.00% |  |  |  |  |  |  |  |  | 50.00%
Cash tender offer price (per share) | $ / shares |  |  |  |  |  |  |  |  | $ 1.50 |  |  |  |
Shares acquired | shares |  | 7.6 |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ 4.0 |  |  |  |  |  |  |  |  |  |  |
Alpha Imaging [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 18.0 |  |  |  |  |  |  |  |  |  |  |  |
Holdback |  |  |  |  |  |  |  |  |  |  |  | 1.0 |
Purchase price withheld |  |  |  |  |  |  |  |  |  |  | $ 0.9 |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  | $ 18.1 |
Health Beacons [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  | 19.3 |  |
Holdback |  |  |  |  |  |  |  |  |  |  | 2.3 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 5.7 |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  | 10.7 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  | $ 2.9 |  |
Other Income |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments |  |  |  |  |  |  |  |  |  | $ 3.3 |  |  |

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