Income Taxes (Details) $ in Millions	3 Months Ended
	Dec. 25, 2015 USD ($)	Dec. 26, 2014 USD ($)	Sep. 25, 2015 USD ($)
Income Taxes [Line Items]
Income tax benefit	$ (32.1)	$ (10.3)
Income (loss) from continuing operations before income taxes	$ 83.8	$ 77.1
Effective tax rate	(38.30%)	(13.40%)
Discontinued Operation, Tax Effect of Discontinued Operation	$ (2.7)
Deferred Tax Assets, Valuation Allowance	29.5
Unrecognized tax benefits	78.7		$ 89.2
Unrecognized tax benefits, net increase	10.5
Unrecognized tax benefits, additions related to prior period tax positions	10.3
Unrecognized tax benefits, additions related to current year tax positions	0.1
Unrecognized tax benefits, decrease related to settlements	0.3
Unrecognized tax benefits, which if favorably settled would benefit the effective tax rate	76.9
Interest accrued on unrecognized tax benefits	38.8		$ 41.7
Unrecognized tax benefits that would impact effective tax rate, upper bound of change	37.4
Income tax penalties and interest accrued that would impact effective tax rate, upper bound of change	$ 30.1
Increase (Decrease) in Effective Tax Rate, Percentage Point	(24.9)
Effective Income Tax Rate Reconciliation, Change in Operating Income, Percentage Point	6.0
Effective Income Tax Rate Reconciliation, Amortization, Percentage Point	15.8
Effective Income Tax Rate Reconciliation, Other, Percentage Point	3.1
Ikaria, Inc.
Income Taxes [Line Items]
Increase in deferred tax liability, net due to installment sale note receivable	$ 521.9
Increase (Decrease) in Income Taxes	42.8
Deferred Tax Liabilities, Intangible Assets	537.6
Increase in deferred tax charge, due to installment sale	26.0
Increase in prepaid taxes, due to installment sale	1.1
Therakos
Income Taxes [Line Items]
Increase in deferred tax liability, net due to installment sale note receivable	251.5
Increase (Decrease) in Income Taxes	17.3
Deferred Tax Liabilities, Intangible Assets	268.5
Increase in prepaid taxes, due to installment sale	0.3
Contrast Media and Delivery Systems
Income Taxes [Line Items]
Discontinued Operation, Tax Effect of Discontinued Operation	(2.7)	$ 1.0
Unrecognized tax benefits, additions related to prior period tax positions	$ 6.8