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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Plan Obligations and Funded Status The following tables summarize the balance sheet impact, including the benefit obligations, assets, and funded status associated with the Company's four defined benefit plans for non-U.S. participants at December 31, 2018 and 2017.
 
December 31,
(in millions)
2018
 
2017
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
57.9

 
$
52.4

Service cost
0.4

 
0.3

Interest cost
1.3

 
1.5

Benefits paid
(1.5
)
 
(1.5
)
Actuarial (gain) loss
(3.8
)
 
0.5

Plan amendments (1)
1.0

 
0.3

Currency translation and other (2)
(1.6
)
 
4.4

Benefit obligation at end of year
53.7

 
57.9

Change in plan assets:
 

 
 

Fair value of plan assets at beginning of year
51.8

 
43.8

Actual return on plan assets
(1.2
)
 
4.4

Company contributions
1.9

 
1.5

Benefits paid
(1.5
)
 
(1.5
)
Currency translation and other
(3.2
)
 
3.6

Fair value of plan assets at end of year
47.8

 
51.8

Funded status
$
(5.9
)
 
$
(6.1
)
 
 
 
 
Amounts recognized in the Consolidated Balance Sheets consist of:
 

 
 

Other assets and deferred charges
$
1.0

 
$
0.4

Other liabilities
(6.9
)
 
(6.5
)
Funded status
$
(5.9
)
 
$
(6.1
)
 
 
 
 
Accumulated other comprehensive loss:
 
 
 
Net actuarial losses
$
18.0

 
$
18.4

Prior service cost
1.3

 
0.3

Deferred taxes
(3.8
)
 
(3.6
)
Total accumulated other comprehensive loss, net of tax
15.5

 
15.1

Net amount recognized
$
9.6

 
$
9.0

 
 
 
 
Accumulated benefit obligation
$
52.6

 
$
57.0
Schedule of Accumulated Benefit Obligations in Excess of Plan Assets Pension plans with accumulated benefit obligations in excess of plan assets consisted of the following at December 31, 2018 and 2017:
 
December 31,
 (in millions)
2018
 
2017
Projected benefit obligation
$
31.2

 
$
35.3

Accumulated benefit obligation
31.0

 
34.8

Fair value of plan assets
24.7

 
28.8
Schedule of Net Periodic Benefit Costs Components of the net periodic benefit cost (income) were as follows:
 
Years Ended December 31,
(in millions)
2018
 
2017
 
2016
Service cost
$
0.4

 
$
0.3

 
$
0.2

Interest cost
1.3

 
1.5

 
1.6

Expected return on plan assets
(2.8
)
 
(2.7
)
 
(2.4
)
Amortization of recognized actuarial loss
0.5

 
0.5

 
0.3

Other (1)
1.3

 
—

 
—

Total net periodic benefit cost (income)
$
0.7


$
(0.4
)
 
$
(0.3
)
Schedule of Assumptions Used The assumptions used in determining the benefit obligations were as follows:
 
December 31,
 
2018
 
2017
Discount rate
 
 
 
Philippines
8.25
%
 
—

Taiwan
1.25
%
 
1.25
%
United Kingdom
2.80
%
 
2.44
%
Weighted-average
2.78
%
 
2.40
%
Average wage increase
 
 
 
Philippines
6.00
%
 
—

Taiwan
4.25
%
 
4.00
%
United Kingdom
4.40
%
 
4.50
%
Weighted-average
4.41
%
 
4.46
%

The assumptions used in determining the net periodic benefit cost (income) were as follows:
 
Years Ended December 31,
 
2018
 
2017
 
2016
Discount rate
 
 
 
 
 
Taiwan
1.25
%
 
1.50
%
 
1.10
%
United Kingdom
2.44
%
 
2.64
%
 
3.90
%
Weighted-average
2.40
%
 
2.60
%
 
3.72
%
Average wage increase
 
 
 
 
 
Taiwan
4.00
%
 
4.00
%
 
4.00
%
United Kingdom
4.50
%
 
4.60
%
 
4.25
%
Weighted-average
4.46
%
 
4.55
%
 
4.16
%
Expected return on plan assets
 
 
 
 
 
Taiwan
1.50
%
 
1.75
%
 
1.50
%
United Kingdom
5.75
%
 
5.90
%
 
6.50
%
Weighted-average
5.64
%
 
5.80
%
 
6.42
%
Fair Value of Plan Assets by Asset Category The fair values of plan assets by asset category within the ASC 820 hierarchy were as follows at December 31, 2018 and 2017:
 
December 31, 2018
 
December 31, 2017
(in millions)
Level 1
 
Level 2
 
Level 3
 
Total Fair Value
 
Level 1
 
Level 2
 
Level 3
 
Total Fair Value
Asset category:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fixed income investments (1)
$
1.9

 
$
18.5

 
$
—

 
$
20.4

 
$
2.3

 
$
12.7

 
$
—

 
$
15.0

Common stock funds (1)
—

 
13.4

 
—

 
13.4

 
—

 
21.9

 
—

 
21.9

Real estate funds
—

 
3.6

 
—

 
3.6

 
—

 
3.5

 
—

 
3.5

Cash and equivalents
0.3

 
0.8

 
—

 
1.1

 
0.1

 
0.9

 
—

 
1.0

Other
5.7

 
3.6

 
—

 
9.3

 
6.8

 
3.6

 
—

 
10.4

Total
$
7.9

 
$
39.9

 
$
—

 
$
47.8

 
$
9.2

 
$
42.6

 
$
—

 
$
51.8
Schedule of Expected Benefit Payments Estimated future benefit payments to retirees, which reflect expected future service, are as follows:
(in millions)
 
2019
$
1.9

2020
1.7

2021
1.7

2022
1.8

2023
1.8

2024-2028
11.5
Non-Qualified Supplemental Retirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Amounts Recognized in Balance Sheet Non-qualified Supplemental Retirement Plan

Knowles provides to certain management employees, through non-qualified plans, supplemental retirement benefits in excess of qualified plan limits imposed by federal tax law. Effective December 31, 2013, the Company's participants no longer accrue benefits. The net amounts recognized on the balance sheet at December 31, 2018 and 2017 are shown in the table below:
 
December 31,
(in millions)
2018
 
2017
Accrued compensation and employee benefits
$
(0.9
)
 
$
(0.2
)
Other liabilities
(0.8
)
 
(1.6
)
Total accumulated other comprehensive loss, net of tax
—

 
0.2

Net amount recognized
$
(1.7
)
 
$
(1.6
)