Pension Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost, before tax	$ 1.0
Unrecognized prior service cost, after tax	1.0
Unrecognized actuarial losses, before tax	74.0
Unrecognized actuarial losses, after tax	56.0
Future actuarial losses, before tax	3.0
Future actuarial losses, after tax	$ 2.0
Redemption notice period	90 days
Compensation expense recognized for 401(k)	$ 53.0	$ 45.0	$ 43.0
Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	1.75%	1.75%	2.25%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	6.00%	6.00%	6.00%
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	3.48%	3.54%	4.29%
Current fiscal year contributions	$ 10.0
Expected contributions in next fiscal year	$ 8.0
Accounting Standards Update 2017-07
Defined Benefit Plan Disclosure [Line Items]
Reclassification of prior year pension cost		$ 4.0	$ 4.8