Income Taxes - Narrative (Details) € in Millions, $ in Millions		12 Months Ended
	Aug. 15, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Nov. 29, 2018 EUR (€)	Dec. 31, 2016 USD ($)
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits liability, interest and penalties accrued		$ 86.8	$ 82.0						$ 63.5
Unrecognized tax benefits that would impact effective tax rate		203.7	204.0						$ 248.7
Penalties and interest expense	$ 163.6			$ 24.7	$ 40.2	$ 61.5	$ 37.2
Tax cuts and jobs act of 2017, change in tax rate, income tax expense (benefit)			(2.4)
Tax cuts and jobs act, transition tax for accumulated foreign earnings			17.5
Tax cuts and jobs act 2017, undistributed accumulated earnings of foreign subsidiary			1,200.0
Tax cuts and jobs act of 2017, transition tax for accumulated foreign earnings, provisional income tax expense (benefit)		6.3
Tax cuts and jobs act of 2017, change in tax rate, provisional income tax expense (benefit)		8.3
Global Intangible Low-taxed Income, income tax expense (benefit)		9.4
Irish Revenue
Operating Loss Carryforwards [Line Items]
Unsettled audit assessment from income tax examination | €								€ 1,636
Belgium Taxing Authority
Operating Loss Carryforwards [Line Items]
Income tax expense as a result of Belgium Tax Act			24.1
Income tax benefit as a result of Belgium Tax Act			$ 33.2
Minimum
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits is reasonably possible		1.0
Maximum
Operating Loss Carryforwards [Line Items]
Decrease in unrecognized tax benefits is reasonably possible		$ 17.9