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Business Combinations Business Combinations - Pro Forma (Details) - Cynosure $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Revenue | $	$ 3,241.4
Net income | $	$ 768.5
Basic earnings per common share (in dollars per share) | $ / shares	$ 2.75
Diluted earnings per common share (in dollars per share) | $ / shares	$ 2.69

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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