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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Net Periodic Pension Cost
The following table provides detail of Net periodic pension cost (benefit) for these four plans.
 
Year Ended December 31,
($ in millions)
2017
2016
2015
Employer service cost - benefits earned during the period
$
1.4

2.0

4.7

Interest cost on projected benefit obligation
10.1

12.3

14.5

Expected return on plan assets
(16.5
)
(19.5
)
(20.9
)
Net amortization of deferrals
2.2

0.7

4.3

Curtailment gain
—

—

(0.4
)
Plan settlements
2.3

—

—

Recognized actuarial loss
0.2

0.2

0.2

Net periodic pension (benefit) cost
$
(0.3
)
(4.3
)
2.4
Schedule of Net Funded Status
The following tables provide reconciliations of projected benefit obligations and plan assets (the net of which represents our funded status), as well as the funded status and accumulated benefit obligations, of our defined benefit pension plans.
($ in millions)
 
Change in benefit obligation:
2017
2016
Projected benefit obligation, January 1,
$
373.9

358.5

Service cost
1.4

2.0

Interest cost
10.1

12.3

Plan settlements
(8.1
)
—

Plan participants' contributions
0.1

0.1

Benefits paid
(11.1
)
(16.2
)
Actuarial (gain) loss
(0.5
)
80.7

Changes in currency translation rates
37.0

(62.1
)
Other
(0.6
)
(1.4
)
Projected benefit obligation, December 31,
$
402.2

373.9

 
 
 
Change in plan assets:
2017
2016
Fair value of plan assets, January 1,
$
364.9

384.9

Actual return on plan assets
18.7

52.6

Plan settlements
(8.1
)
—

Plan contributions
8.1

8.4

Benefits paid
(11.1
)
(16.2
)
Changes in currency translation rates
36.9

(63.4
)
Other
(0.5
)
(1.4
)
Fair value of plan assets, December 31,
$
408.9

364.9

 
 
 
Funded status and net amount recognized
$
6.7

(9.0
)
 
 
 
Accumulated benefit obligation, December 31,
$
402.2

373.9
Schedule of Amounts Recognized in Balance Sheet
Defined benefit pension plan amounts recorded in the Consolidated Balance Sheets are presented in the below table.
 
December 31,
($ in millions)
2017
2016
Pension assets (included in Other assets)
$
22.4

11.2

Pension liabilities (included in Other liabilities)
(15.7
)
(20.2
)
Net asset (liability) recognized
$
6.7

(9.0
)
 
 
 
Actuarial losses
$
91.9

90.8

Prior service costs
0.3

0.4

Accumulated other comprehensive loss
$
92.2

91.2
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
The amounts recognized in Other comprehensive income are presented in the table below.
 
Year Ended December 31,
($ in millions)
2017
2016
2015
Current year actuarial (gains) losses
$
(3.2
)
44.2

(25.2
)
Reclassification adjustments included in Net periodic pension cost
(4.7
)
(0.9
)
(4.1
)
Change in currency translation rates
8.9

(11.7
)
(3.5
)
Total
$
1.0

31.6

(32.8
)
Schedule of Assumptions Used
The ranges of assumptions we used in developing the projected benefit obligation as of December 31 are presented in the following table.
 
2017
 
2016
Discount rate used in determining present values
2.00%
to
2.55%
 
2.00%
to
2.70%
Annual increase in future compensation levels
0.00%
to
3.75%
 
0.00%
to
3.65%
The ranges of assumptions we used in determining net periodic cost (benefit) for the years ended December 31 are presented in the following table.
 
2017
 
2016
 
2015
Discount rate used in determining present values
2.00%
to
2.70%
 
2.00%
to
3.90%
 
2.25%
to
3.70%
Annual increase in future compensation levels
0.00%
to
3.65%
 
0.00%
to
3.50%
 
0.00%
to
3.50%
Expected long-term rate of return on assets
2.30%
to
4.90%
 
2.00%
to
5.90%
 
2.70%
to
5.80%
Schedule of Allocation of Plan Assets
Pension plan assets measured at fair value and cash are presented in the following table with the overall allocation of pension plan assets.
 
December 31, 2017
 
December 31, 2016
($ in millions)
Level 1
Level 2
Level 3
 
Total
 
Level 1
Level 2
Level 3
 
Total
Equity securities
$
105.7

—

—

 
$
105.7

 
$
112.6



—

 
$
112.6

Debt securities:
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
150.5

5.2

—

 
155.7

 
121.3

3.6



 
124.9

Government and other
17.8

7.5

—

 
25.3

 
14.8

2.7

—

 
17.5

Other
3.6

7.0

31.0

 
41.6

 
3.9

2.5

29.2

 
35.6

Total plan assets at fair value
$
277.6

19.7

31.0

 
328.3

 
$
252.6

8.8

29.2

 
290.6

Cash & cash equivalents
 
 
 
 
3.4

 
 
 
 
 
6.6

Assets measured at NAV
 
 
 
 
77.2

 
 
 
 
 
67.7

Total plan assets
 
 
 
 
$
408.9

 
 
 
 
 
$
364.9
Schedule of Expected Benefit Payments
In addition, pension benefit payments expected to be paid as of December 31, 2017, which reflect expected future service, as appropriate, are presented in the following table.
($ in millions)
Expected future minimum pension benefit payments
2018
$
20.5

2019
21.2

2020
21.7

2021
22.4

2022
23.0

2023 to 2027
125.4

Total
$
234.2