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Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Apr. 07, 2017 | Mar. 22, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 802.9 | $ 806.1 | $ 715.4 | $ 734.4 | $ 726.8 | $ 717.4 | $ 693.3 | $ 695.2 |  | $ 3,058.8 | $ 2,832.7 | $ 2,705.0
Pre-tax loss |  |  |  |  |  |  |  |  |  |  |  | (1,370.2) | (548.6) | $ (455.1)
Goodwill |  |  | 3,171.2 |  |  |  | $ 2,803.1 |  |  |  | $ 3,171.2 | $ 3,171.2 | $ 2,803.1 |
Cynosure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) |  | $ 66.00 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding noncontrolling shares (in shares) |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | $ 1,660.0 |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  | 18.8 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 994.0 |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 207.5 |  |  |
Pre-tax loss |  |  |  |  |  |  |  |  |  |  | $ 96.4 |  |  |
Goodwill |  | 683.5 |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 44.1 |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | 107.0 |  |  |  |  |  |  |  |  |  |  |  |
Estimated costs to complete |  | $ 18.0 |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project fair value |  |  | 61.0 |  |  |  |  |  |  |  |  |  |  |
Estimated cost to complete project |  |  | $ 4.0 |  |  |  |  |  |  |  |  |  |  |
Weighted average period |  | 11 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | Distribution agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period |  | 7 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period |  | 8 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | Minimum | Other intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | Minimum | In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  | 14.00% |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | Maximum | Other intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |
Cynosure | Maximum | In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate (as a percent) |  | 22.00% |  |  |  |  |  |  |  |  |  |  |  |
Medicor Medical Supply |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid | $ 19.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 5.4 |  |  | $ 5.4 |  |  |  |  |  |  |  |  |  |
Weighted average period | 7 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition price adjustment | $ 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price withheld | 1.9 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 8.9 |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ 4.7 |  |  |  |  |  |  |  |  |  |  |  |  |

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