Pension and Other Post Retirement Plans (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
UNITED STATES | Other Benefits [Member]
Components of net periodic benefit cost (income):
Service cost	$ 0.8	$ 0.9
Interest cost	1.0	1.2
Special termination benefits(2)	(12.0)	(3.9)
Other changes recognized in OCI:
Accumulated gain (loss)	$ 19.3	$ 22.6
Total recognized in other net periodic benefit and OCI (income) loss
Discount rate	1.26%	2.55%
Medical Assumptions:
Trend assumed for the year	5.56%	5.90%
Ultimate trend rate	4.50%	4.50%
Year that ultimate trend rate is reached	2038	2038
UNITED STATES | Other Benefits [Member] | Annual Expense [Member]
Components of net periodic benefit cost (income):
Service cost	$ 0.8	$ 0.9	$ 1.1
Interest cost	1.0	1.2	1.1
Expected return on plan assets	0.0	0.0	0.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.9	0.9	0.9
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0.0	0.0	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	(0.2)	0.0	0.0
Special termination benefits(2)	12.0	3.9	0.0
Net periodic benefit cost (income)	11.0	2.9	(1.0)
Defined Benefit Plan, Amortization of Gain (Loss)	1.7	2.2	2.3
Other changes recognized in OCI:
Accumulated gain (loss)	1.0	4.9	0.8
Total recognized in net periodic benefit cost and OCI	$ (12.0)	$ 7.8	$ (0.2)
Total recognized in other net periodic benefit and OCI (income) loss
Discount rate	2.55%	3.74%	3.03%
Medical Assumptions:
Trend assumed for the year	5.90%	6.24%	6.59%
Ultimate trend rate	4.50%	4.50%	4.50%
Year that ultimate trend rate is reached	2038	2038	2038
UNITED STATES | Pension Plan [Member]
Components of net periodic benefit cost (income):
Service cost	$ 0.0	$ 0.0
Interest cost	24.4	36.5
Special termination benefits(2)	(31.0)	(5.2)
Other changes recognized in OCI:
Accumulated gain (loss)	$ (6.5)	$ (46.0)
Total recognized in other net periodic benefit and OCI (income) loss
Discount rate	2.31%	3.19%
UNITED STATES | Pension Plan [Member] | Annual Expense [Member]
Components of net periodic benefit cost (income):
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	24.4	36.5	34.7
Expected return on plan assets	(64.2)	(66.7)	(66.9)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	9.8	3.4	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	33.9	0.0	0.0
Special termination benefits(2)	31.0	5.2	0.0
Net periodic benefit cost (income)	35.1	(21.1)	(32.2)
Defined Benefit Plan, Amortization of Gain (Loss)	(0.2)	(0.5)	0.0
Other changes recognized in OCI:
Accumulated gain (loss)	(39.4)	(95.9)	52.3
Total recognized in net periodic benefit cost and OCI	$ 4.3	$ (117.0)	$ 20.1
Total recognized in other net periodic benefit and OCI (income) loss
Discount rate	3.19%	4.21%	3.59%
Expected return on plan assets	4.50%	5.00%	4.80%
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ 0.0
UNITED KINGDOM | Pension Plan [Member]
Components of net periodic benefit cost (income):
Service cost	0.9	$ 0.9
Interest cost	1.2	1.6
Other changes recognized in OCI:
Accumulated gain (loss)	$ 5.8	$ 5.9
Total recognized in other net periodic benefit and OCI (income) loss
Discount rate	1.45%	2.10%
Salary increases	3.10%	3.15%
UNITED KINGDOM | Pension Plan [Member] | Annual Expense [Member]
Components of net periodic benefit cost (income):
Service cost	$ 0.9	$ 0.9	$ 1.3
Interest cost	1.2	1.7	1.7
Expected return on plan assets	(1.7)	(2.4)	(2.8)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(0.4)	(0.2)	(0.4)
Net periodic benefit cost (income)	0.0	0.0	(0.2)
Other changes recognized in OCI:
Accumulated gain (loss)	(0.9)	(3.2)	(0.5)
Total recognized in net periodic benefit cost and OCI	$ 0.9	$ (3.2)	$ (0.7)
Total recognized in other net periodic benefit and OCI (income) loss
Discount rate	2.10%	3.00%	2.60%
Expected return on plan assets	2.00%	3.10%	3.10%
Salary increases	3.15%	3.40%	3.35%