Pensions - Summary of Change in Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
U.S. Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fees, commissions and other expense paid from plan assets		$ 2.2	$ 1.9
Change in Plan Assets
Fair value of plan assets, beginning of year		131.1	128.1
Actual return on plan assets	[1]	17.7	6.6
Company contribution		5.0	5.6
Benefits and expenses paid		(8.4)	(9.2)
Settlement payments		(13.7)	0.0
Foreign currency translation		0.0	0.0
Fair value of plan assets, end of year		131.7	131.1
Non-U.S. Benefit Plan
Change in Plan Assets
Fair value of plan assets, beginning of year		48.5	54.3
Actual return on plan assets		3.9	6.2
Company contribution		0.9	1.3
Benefits and expenses paid		(3.3)	(4.2)
Settlement payments		0.0	0.0
Foreign currency translation		4.7	(9.1)
Fair value of plan assets, end of year		$ 54.7	$ 48.5

[1] Actual return on plan assets of the U.S. benefit plan for the years ended December 31, 2017 and 2016, was net of fees, commissions and other expenses paid from plan assets of $2.2 million and $1.9 million, respectively.