Income Taxes - Pre-tax Income and the Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pre-tax income:
Ireland	$ (411.8)	$ (300.3)	$ (109.0)
United States	147.3	(291.9)	(428.6)
Other foreign	115.1	763.2	828.2
Income (loss) before income taxes	(149.4)	171.0	290.6
Current provision (benefit) for income taxes:
Ireland	2.7	(2.2)	22.7
United States	17.6	51.0	66.4
Other foreign	47.4	16.1	75.1
Subtotal	67.7	64.9	164.2
Deferred provision (benefit) for income taxes:
Ireland	(0.1)	0.0	(13.9)
United States	(52.3)	(30.2)	7.3
Other foreign	(2.1)	(9.8)	2.0
Subtotal	(54.5)	(40.0)	(4.6)
Total provision for income taxes	$ 13.2	$ 24.9	$ 159.6