Post Employment Plans - Additional Information (Details) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) years	Dec. 31, 2016 USD ($)	Jun. 27, 2015	Dec. 31, 2013 plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amount to be amortized from accumulated other comprehensive income (loss) next fiscal year		$ 0.7
Expected future benefit payments, year one through five		9.9
Estimated future employer contributions in next fiscal year		$ 2.2
Other plans without target asset allocations | Insurance contracts
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, target allocation, percentage		100.00%
Other Postretirement Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected future benefit payments, year one through five		$ 1.0
Postretirement health coverage
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retiree eligible age | years		65
Pension plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on assets, percent	2.93%	2.90%	2.89%	2.85%
Deferred compensation arrangement with individual, by type of compensation, pension and Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cash surrender value of insurance policies	$ 34.6	$ 34.6	$ 32.7
Deferred compensation liability, non-current	$ 34.5	$ 31.6	$ 29.3
Unites States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer nondiscretionary contribution to plan		3.00%
Ireland
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution, percent of employees' gross pay		18.00%
Elan corporation
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of defined benefit plans assumed | plan					2