Employee Benefit Plans - Change in Benefit Obligation and Funded Status (Details) - Foreign Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 52.4	$ 51.0
Service cost	0.3	0.2	$ 0.2
Interest cost	1.5	1.6	2.0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	1.5	1.7
Actuarial loss	0.5	10.1
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0.3	0.0
Settlements and curtailments	0.0	(0.2)
Currency translation and other	4.4	(8.6)
Benefit obligation at end of year	57.9	52.4	51.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	43.8	45.1
Actual return on plan assets	4.4	6.7
Company contributions	1.5	1.7
Defined Benefit Plan, Plan Assets, Benefits Paid	1.5	1.7
Settlements and curtailments	0.0	(0.2)
Currency translation and other	3.6	(7.8)
Fair value of plan assets at end of year	51.8	43.8	$ 45.1
Funded status	(6.1)	(8.6)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets and deferred charges	0.4	0.0
Other liabilities	(6.5)	(8.6)
Funded status	(6.1)	(8.6)
Accumulated Other Comprehensive Loss (Earnings) [Abstract]
Net actuarial losses	18.4	20.1
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	0.3	0.0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), Tax	(3.6)	(3.6)
Total Accumulated Other Comprehensive Loss, net of tax	15.1	16.5
Amounts recognized on the balance sheet including accumulated other comprehensive income (loss)	9.0	7.9
Accumulated benefit obligation	$ 57.0	$ 51.3