Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Net Period Benefit Cost (Credit) [Abstract]
Curtailment	$ (3.5)	$ 0.0	$ 0.0
Other Nonoperating Income (Expense) [Member]
Other changes in plan assets and benefit obligations recognized in OCI, pre-tax:
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	3.5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	3.5
Pension Plan [Member]
Defined Benefit Plan, Net Period Benefit Cost (Credit) [Abstract]
Service cost	1.4	10.8	10.4
Interest cost	9.2	9.4	9.8
Expected return on assets	(12.0)	(15.7)	(13.5)
Amortization of prior service credit	0.1	(1.3)	(1.3)
Amortization of actuarial loss (gain)	2.1	3.8	4.9
Net periodic benefit cost	4.3	7.0	10.3
Other changes in plan assets and benefit obligations recognized in OCI, pre-tax:
Net loss (gain) arising during period	1.5	3.5	(9.0)
Prior service credit arising during period	0.0	0.3	0.0
Amortization of prior service credit	(0.1)	1.3	1.3
Amortization of actuarial (loss) gain	(2.1)	(3.8)	(4.9)
Foreign currency translation	0.6	(1.2)	2.6
Total recognized in OCI	(3.6)	0.1	(10.0)
Total recognized in net periodic benefit cost and OCI	0.7	$ 7.1	0.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	3.5
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax	$ (3.5)
Rate of compensation increase	2.49%	4.01%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 3.5
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Period Benefit Cost (Credit) [Abstract]
Service cost	0.0	$ 0.0	0.0
Interest cost	0.2	0.2	0.3
Expected return on assets	0.0	0.0	0.0
Amortization of prior service credit	(0.7)	(0.7)	(0.7)
Amortization of actuarial loss (gain)	(2.3)	(2.4)	(2.6)
Net periodic benefit cost	(2.8)	(2.9)	(3.0)
Other changes in plan assets and benefit obligations recognized in OCI, pre-tax:
Net loss (gain) arising during period	0.1	(1.4)	(1.1)
Prior service credit arising during period	0.0	0.0	0.0
Amortization of prior service credit	0.7	0.7	0.7
Amortization of actuarial (loss) gain	2.3	2.4	2.6
Foreign currency translation	0.0	0.0	0.0
Total recognized in OCI	3.1	1.7	2.2
Total recognized in net periodic benefit cost and OCI	$ 0.3	$ (1.2)	(0.8)
Foreign Plan [Member]
Other changes in plan assets and benefit obligations recognized in OCI, pre-tax:
Rate of compensation increase	2.49%	2.60%
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Net Period Benefit Cost (Credit) [Abstract]
Net periodic benefit cost	$ 1.9	$ 2.2	3.0
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Period Benefit Cost (Credit) [Abstract]
Net periodic benefit cost	$ 0.0	$ 0.0	0.0
United States [Member]
Other changes in plan assets and benefit obligations recognized in OCI, pre-tax:
Rate of compensation increase	4.25%	4.25%
United States [Member] | Pension Plan [Member]
Defined Benefit Plan, Net Period Benefit Cost (Credit) [Abstract]
Net periodic benefit cost	$ 2.4	$ 4.8	7.3
United States [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Period Benefit Cost (Credit) [Abstract]
Net periodic benefit cost	$ (2.8)	$ (2.9)	$ (3.0)