Benefit Plans, Reconciliation of Changes in Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 262.2
Fair value of plan assets ending balance	301.8	$ 262.2
Pension Benefits [Member] | U.S. Plans [Member]
Reconciliation of Benefit Obligations [Roll Forward]
Beginning balance	59.7	67.1
Service cost	0.0	0.0	$ 0.0
Interest cost	2.3	2.5	2.6
Actuarial (gains) losses	2.0	(4.1)
Benefit payments	(2.8)	(2.9)
Plan curtailments	0.0	0.0
Plan settlements	(1.5)	(2.9)
Effect of foreign currency exchange rate changes	0.0	0.0
Benefit obligations ending balance	59.7	59.7	67.1
Reconciliation of Fair Value of Plan Assets [Roll Forward]
Beginning balance	59.3	60.8
Actual return on plan assets	8.0	4.2
Employer contributions	0.1	0.1
Plan settlements	(1.5)	(2.9)
Benefit payments	(2.8)	(2.9)
Effect of foreign currency exchange rate changes	0.0	0.0
Fair value of plan assets ending balance	63.1	59.3	60.8
Funded Status as of Period End	3.4	(0.4)
Pension Benefits [Member] | Non-U.S. Plans [Member]
Reconciliation of Benefit Obligations [Roll Forward]
Beginning balance	323.7	310.4
Service cost	1.9	1.6	1.8
Interest cost	7.8	8.8	9.5
Actuarial (gains) losses	(22.5)	51.5
Benefit payments	(9.1)	(9.2)
Plan curtailments	0.0	(0.1)
Plan settlements	0.0	0.0
Effect of foreign currency exchange rate changes	34.1	(39.3)
Benefit obligations ending balance	335.9	323.7	310.4
Reconciliation of Fair Value of Plan Assets [Roll Forward]
Beginning balance	202.9	204.4
Actual return on plan assets	17.9	32.8
Employer contributions	5.7	5.2
Plan settlements	0.0	0.0
Benefit payments	(9.1)	(9.2)
Effect of foreign currency exchange rate changes	21.3	(30.3)
Fair value of plan assets ending balance	238.7	202.9	204.4
Funded Status as of Period End	(97.2)	(120.8)
Other Postretirement Benefits [Member]
Reconciliation of Benefit Obligations [Roll Forward]
Beginning balance	3.2	3.3
Service cost	0.0	0.0	0.0
Interest cost	0.1	0.2	0.2
Actuarial (gains) losses	0.2	0.0
Benefit payments	(0.2)	(0.2)
Plan curtailments	0.0	0.0
Plan settlements	0.0	0.0
Effect of foreign currency exchange rate changes	0.1	(0.1)
Benefit obligations ending balance	3.4	3.2	$ 3.3
Reconciliation of Fair Value of Plan Assets [Roll Forward]
Funded Status as of Period End	$ (3.4)	$ (3.2)