Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Activity in Plan Asset Measured Using Level 3 Inputs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	$ 776.2	$ 771.8
Foreign exchange (loss) gain	(33.8)	44.6
Fair value of plan assets at end of period	668.7	776.2
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	86.5
Fair value of plan assets at end of period	165.4	86.5
U.S. and International | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	86.5	100.7
(Losses) gains on assets still held at end of year	(15.5)	2.3
Purchases, sales, issuance, and settlements	103.6	1.3
Transfers in and/or out of Level 3	1.0	(24.2)
Foreign exchange (loss) gain	(10.2)	6.4
Fair value of plan assets at end of period	$ 165.4	$ 86.5