Employee Benefit Plans (Reconciliation of Benefit Obligations, Plan Assets and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amount Recognized in Balance Sheet:
Other assets	$ 527.7	$ 390.4
Accrued compensation	(114.5)	(85.5)
Other Postretirement Benefits Plan
Change in Benefit Obligation:
Beginning balance	(26.0)	(28.2)
Service cost	(0.1)	(0.1)	$ (0.1)
Interest cost	(1.2)	(1.1)	(1.3)
Actuarial (loss) gain	(2.5)	1.2
Benefits paid	1.4	1.4
Actual expenses and taxes	0.0	0.0
Plan amendments	1.4	0.0
Curtailments	0.0	0.0
Settlements	0.0	0.0
Special termination benefits	0.0	(0.1)
Foreign currency changes and other	0.2	0.9
Ending balance	(26.8)	(26.0)	(28.2)
Change in Plan Assets:
Beginning balance	0.0	0.0
Actual return on plan assets	0.0	0.0
Company contributions	(1.4)	1.4
Benefits paid	1.4	(1.4)
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	(26.8)	(26.0)
Amount Recognized in Balance Sheet:
Other assets	0.0	0.0
Accrued compensation	(4.2)	(4.5)
Employee benefit plans liability	(22.6)	(21.5)
Net amount recognized	(26.8)	(26.0)
Pretax Amounts Recognized in Accumulated Other Comprehensive Loss:
Net actuarial loss	2.4	0.0
Prior service (credit) cost	(1.7)	0.6
Total pretax amount recognized	0.7	0.6
U.S. | Pension Plan
Change in Benefit Obligation:
Beginning balance	(74.7)	(88.9)
Service cost	(1.7)	(2.9)	(4.3)
Interest cost	(2.3)	(2.3)	(3.0)
Actuarial (loss) gain	(5.8)	9.9
Benefits paid	12.8	7.8
Actual expenses and taxes	0.0	0.0
Plan amendments	0.0	0.0
Curtailments	0.0	1.7
Settlements	0.0	0.0
Special termination benefits	0.0	0.0
Foreign currency changes and other	0.0	0.0
Ending balance	(71.7)	(74.7)	(88.9)
Change in Plan Assets:
Beginning balance	62.7	63.1
Actual return on plan assets	12.3	(5.4)
Company contributions	1.1	12.8
Benefits paid	(12.8)	(7.8)
Settlements	0.0	0.0
Foreign currency changes and other	0.0	0.0
Ending balance	63.3	62.7	63.1
Funded Status:
Funded status at end of year	(8.4)	(12.0)
Amount Recognized in Balance Sheet:
Other assets	0.0	0.0
Accrued compensation	(1.1)	(1.0)
Employee benefit plans liability	(7.3)	(11.0)
Net amount recognized	(8.4)	(12.0)
Pretax Amounts Recognized in Accumulated Other Comprehensive Loss:
Net actuarial loss	24.3	33.1
Prior service (credit) cost	(0.1)	(0.1)
Total pretax amount recognized	24.2	33.0
Supplemental Information:
Accumulated benefit obligation	70.4	72.7
Plans with Projected Benefit Obligation in Excess of Plan Assets:
Projected benefit obligation	71.7	74.7
Fair value plan assets	63.3	62.7
Plans with Accumulated Benefit Obligation in Excess of Plan Assets:
Projected benefit obligation	7.7	74.7
Accumulated benefit obligation	7.3	72.7
Fair value plan assets	0.0	62.7
Non-U.S. Plans | Pension Plan
Change in Benefit Obligation:
Beginning balance	(617.0)	(714.2)
Service cost	(4.0)	(4.7)	(4.6)
Interest cost	(15.3)	(15.4)	(18.0)
Actuarial (loss) gain	(71.5)	47.4
Benefits paid	27.4	35.5
Actual expenses and taxes	0.4	0.5
Plan amendments	0.0	(2.2)
Curtailments	0.8	0.0
Settlements	6.6	2.6
Special termination benefits	0.0	0.0
Foreign currency changes and other	(13.3)	33.5
Ending balance	(685.9)	(617.0)	(714.2)
Change in Plan Assets:
Beginning balance	615.8	705.4
Actual return on plan assets	89.0	(27.7)
Company contributions	7.3	11.6
Benefits paid	(27.4)	(35.5)
Settlements	(6.6)	(2.6)
Foreign currency changes and other	17.3	(35.4)
Ending balance	695.4	615.8	$ 705.4
Funded Status:
Funded status at end of year	9.5	(1.2)
Amount Recognized in Balance Sheet:
Other assets	100.6	88.1
Accrued compensation	(1.9)	(2.8)
Employee benefit plans liability	(89.1)	(86.5)
Net amount recognized	9.6	(1.2)
Pretax Amounts Recognized in Accumulated Other Comprehensive Loss:
Net actuarial loss	183.8	173.6
Prior service (credit) cost	1.4	1.3
Total pretax amount recognized	185.2	174.9
Supplemental Information:
Accumulated benefit obligation	181.9	179.9
Plans with Projected Benefit Obligation in Excess of Plan Assets:
Projected benefit obligation	197.5	195.3
Fair value plan assets	106.5	106.0
Plans with Accumulated Benefit Obligation in Excess of Plan Assets:
Projected benefit obligation	188.3	185.7
Accumulated benefit obligation	176.2	174.6
Fair value plan assets	98.2	98.0
Domestic equity | U.S. | Pension Plan
Change in Plan Assets:
Beginning balance	8.4
Ending balance	10.1	8.4
Domestic equity | Non-U.S. Plans | Pension Plan
Change in Plan Assets:
Beginning balance	25.8
Ending balance	$ 25.4	$ 25.8