Employee Benefit Plans (Reconciliation of Benefit Obligations, Plan Assets and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amount Recognized in Balance Sheet:
Other assets	$ 603.0	$ 666.2
Accrued compensation	(85.5)	(130.3)
Other Postretirement Benefits Plan
Change in Benefit Obligation:
Beginning balance	(28.2)	(26.0)
Service cost	(0.1)	(0.1)	$ (0.1)
Interest cost	(1.1)	(1.3)	(1.7)
Actuarial (loss) gain	1.2	0.3
Benefits paid	1.4	0.4
Actual expenses and taxes	0.0	0.0
Plan amendments	0.0	0.0
Curtailments	0.0	0.0
Settlements	0.0	0.0
Special termination benefits	(0.1)	0.0
Foreign currency changes and other	0.9	(1.5)
Ending balance	(26.0)	(28.2)	(26.0)
Change in Plan Assets:
Beginning balance	0.0	0.0
Actual return on plan assets	0.0	0.0
Company contributions	1.4	0.4
Benefits paid	(1.4)	(0.4)
Settlements	0.0	0.0
Foreign currency changes and other	0.0	0.0
Ending balance	0.0	0.0	0.0
Funded Status:
Funded status at end of year	(26.0)	(28.2)
Amount Recognized in Balance Sheet:
Other assets	0.0	0.0
Accrued compensation	(4.5)	(2.7)
Employee benefit plans liability	(21.5)	(25.5)
Net amount recognized	(26.0)	(28.2)
Pretax Amounts Recognized in Accumulated Other Comprehensive Loss:
Net actuarial loss	0.0	1.2
Prior service (credit) cost	0.6	(1.3)
Total pretax amount recognized	0.6	(0.1)
U.S. | Pension Plan
Change in Benefit Obligation:
Beginning balance	(88.9)	(87.6)
Service cost	(2.9)	(4.3)	(6.4)
Interest cost	(2.3)	(3.0)	(6.5)
Actuarial (loss) gain	9.9	0.6
Benefits paid	7.8	5.4
Actual expenses and taxes	0.0	0.0
Plan amendments	0.0	0.0
Curtailments	1.7	0.0
Settlements	0.0	0.0
Special termination benefits	0.0	0.0
Foreign currency changes and other	0.0	0.0
Ending balance	(74.7)	(88.9)	(87.6)
Change in Plan Assets:
Beginning balance	63.1	51.4
Actual return on plan assets	(5.4)	5.5
Company contributions	12.8	11.6
Benefits paid	(7.8)	(5.4)
Settlements	0.0	0.0
Foreign currency changes and other	0.0	0.0
Ending balance	62.7	63.1	51.4
Funded Status:
Funded status at end of year	(12.0)	(25.8)
Amount Recognized in Balance Sheet:
Other assets	0.0	0.0
Accrued compensation	(1.0)	(1.0)
Employee benefit plans liability	(11.0)	(24.8)
Net amount recognized	(12.0)	(25.8)
Pretax Amounts Recognized in Accumulated Other Comprehensive Loss:
Net actuarial loss	33.1	41.4
Prior service (credit) cost	(0.1)	(0.2)
Total pretax amount recognized	33.0	41.2
Supplemental Information:
Accumulated benefit obligation	72.7	85.9
Plans with Projected Benefit Obligation in Excess of Plan Assets:
Projected benefit obligation	74.7	88.9
Fair value plan assets	62.7	63.1
Plans with Accumulated Benefit Obligation in Excess of Plan Assets:
Projected benefit obligation	74.7	88.9
Accumulated benefit obligation	72.7	85.9
Fair value plan assets	62.7	63.1
Non-U.S. Plans | Pension Plan
Change in Benefit Obligation:
Beginning balance	(714.2)	(652.9)
Service cost	(4.7)	(4.6)	(5.0)
Interest cost	(15.4)	(18.0)	(21.8)
Actuarial (loss) gain	47.4	(15.5)
Benefits paid	35.5	42.5
Actual expenses and taxes	0.5	0.0
Plan amendments	(2.2)	0.0
Curtailments	0.0	0.0
Settlements	(2.6)	0.0
Special termination benefits	0.0	0.0
Foreign currency changes and other	33.5	(65.7)
Ending balance	(617.0)	(714.2)	(652.9)
Change in Plan Assets:
Beginning balance	705.4	613.7
Actual return on plan assets	(27.7)	49.9
Company contributions	11.6	19.7
Benefits paid	(35.5)	(42.5)
Settlements	(2.6)	0.0
Foreign currency changes and other	(35.4)	64.6
Ending balance	615.8	705.4	$ 613.7
Funded Status:
Funded status at end of year	(1.2)	(8.8)
Amount Recognized in Balance Sheet:
Other assets	88.1	82.0
Accrued compensation	(2.8)	(2.2)
Employee benefit plans liability	(86.5)	(88.6)
Net amount recognized	(1.2)	(8.8)
Pretax Amounts Recognized in Accumulated Other Comprehensive Loss:
Net actuarial loss	173.6	176.8
Prior service (credit) cost	1.3	(0.9)
Total pretax amount recognized	174.9	175.9
Supplemental Information:
Accumulated benefit obligation	179.9	199.8
Plans with Projected Benefit Obligation in Excess of Plan Assets:
Projected benefit obligation	195.3	216.7
Fair value plan assets	106.0	125.9
Plans with Accumulated Benefit Obligation in Excess of Plan Assets:
Projected benefit obligation	185.7	202.0
Accumulated benefit obligation	174.6	191.9
Fair value plan assets	$ 98.0	$ 114.0