Pension and Postretirement Benefit Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets (Period Start)	$ 461.1
Fair Value of Plan Assets (Period End)	503.0	$ 461.1
Domestic Plan [Member]
Benefit Obligation [Roll Forward]
Benefit obligation (period start)	126.6	126.9
Service cost	0.0	0.0	$ 0.0
Interest cost	5.1	5.9	0.3
Benefits Paid	(11.4)	(13.6)
Plan participant contributions	0.0	0.0
Actuarial losses (gains)	5.1	7.4
Settlements and curtailments	0.0	0.0
Foreign currency effect	0.0	0.0
Other	0.0	0.0
Benefit Obligation (Period End)	125.4	126.6	126.9
Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets (Period Start)	95.2	101.1
Actual return on plan assets	12.4	7.7
Employer contributions	2.6	0.0
Plan participant contributions	0.0	0.0
Benefits paid	(11.4)	(13.6)
Settlements	0.0	0.0
Foreign currency effect	0.0	0.0
Other	0.0	0.0
Fair Value of Plan Assets (Period End)	98.8	95.2	101.1
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(26.6)	(31.4)
Amounts Recognized in Consolidated Balance Sheets
Non-current asset	0.0	0.0
Current liability	0.0	0.0
Non-current liability	(26.6)	(31.4)
Net liability recognized	(26.6)	(31.4)
Accumulated benefit obligation	125.4	126.6
Amounts recognized in Accumulated Other Comprehensive Loss, net
Net actuarial loss	52.2	54.9
Prior service cost (credit)	0.0	0.0
Total amount recognized	52.2	54.9
Net actuarial losses from AOCI into net periodic cost	1.5
Pension plans with underfunded or unfunded accumulated benefit obligation
Aggregate projected benefit obligation	125.4	126.6
Aggregate accumulated benefit obligation	125.4	126.6
Aggregate fair value of plan assets	98.8	95.2
Foreign Plan [Member]
Benefit Obligation [Roll Forward]
Benefit obligation (period start)	530.6	537.9
Service cost	4.9	6.7	11.1
Interest cost	13.5	15.1	18.9
Benefits Paid	(19.0)	(25.7)
Plan participant contributions	0.2	0.2
Actuarial losses (gains)	20.3	115.6
Settlements and curtailments	(19.8)	(6.3)
Foreign currency effect	50.4	(84.2)
Other	1.2	(28.7)
Benefit Obligation (Period End)	582.3	530.6	537.9
Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets (Period Start)	365.9	399.6
Actual return on plan assets	25.1	47.9
Employer contributions	17.5	23.2
Plan participant contributions	0.2	0.2
Benefits paid	(19.0)	(25.7)
Settlements	(19.1)	(2.2)
Foreign currency effect	33.2	(68.6)
Other	0.4	(8.5)
Fair Value of Plan Assets (Period End)	404.2	365.9	399.6
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(178.1)	(164.7)
Amounts Recognized in Consolidated Balance Sheets
Non-current asset	9.0	7.6
Current liability	(6.5)	(5.5)
Non-current liability	(180.6)	(166.8)
Net liability recognized	(178.1)	(164.7)
Accumulated benefit obligation	577.9	526.2
Amounts recognized in Accumulated Other Comprehensive Loss, net
Net actuarial loss	201.6	183.4
Prior service cost (credit)	1.1	0.9
Total amount recognized	202.7	184.3
Net actuarial losses from AOCI into net periodic cost	6.0
Pension plans with underfunded or unfunded accumulated benefit obligation
Aggregate projected benefit obligation	576.6	525.3
Aggregate accumulated benefit obligation	575.2	523.8
Aggregate fair value of plan assets	389.5	352.9
Other Postretirement Benefits Plan [Member]
Benefit Obligation [Roll Forward]
Benefit obligation (period start)	32.3	33.9
Service cost	0.0	0.0	0.0
Interest cost	1.3	1.5	1.5
Benefits Paid	(5.9)	(5.8)
Plan participant contributions	1.6	1.6
Actuarial losses (gains)	2.5	1.1
Settlements and curtailments	0.0	0.0
Foreign currency effect	0.0	0.0
Other	0.0	0.0
Benefit Obligation (Period End)	31.8	32.3	33.9
Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets (Period Start)	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	4.3	4.2
Plan participant contributions	1.6	1.6
Benefits paid	(5.9)	(5.8)
Settlements	0.0	0.0
Foreign currency effect	0.0	0.0
Other	0.0	0.0
Fair Value of Plan Assets (Period End)	0.0	0.0	$ 0.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(31.8)	(32.3)
Amounts Recognized in Consolidated Balance Sheets
Non-current asset	0.0	0.0
Current liability	(3.1)	(3.2)
Non-current liability	(28.7)	(29.1)
Net liability recognized	(31.8)	(32.3)
Amounts recognized in Accumulated Other Comprehensive Loss, net
Net actuarial loss	4.2	1.7
Prior service cost (credit)	(0.4)	(0.6)
Total amount recognized	3.8	$ 1.1
Other Foreign Pension Plans
Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 56.2