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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [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)
2016
2015
2014
Employer service cost - benefits earned during the period
$
2.0

4.7

3.7

Interest cost on projected benefit obligation
12.3

14.5

16.1

Expected return on plan assets
(19.5
)
(20.9
)
(24.5
)
Net amortization of deferrals
0.7

4.3

1.0

Curtailment gain
—

(0.4
)
—

Recognized actuarial loss
0.2

0.2

0.2

Net periodic pension cost (benefit)
$
(4.3
)
2.4

(3.5
)
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:
2016
2015
Projected benefit obligation, January 1,
$
358.5

427.2

Service cost
2.0

4.7

Interest cost
12.3

14.5

Curtailments
—

(3.6
)
Plan participants' contributions
0.1

0.4

Benefits paid
(16.2
)
(10.1
)
Actuarial loss (gain)
80.7

(49.6
)
Changes in currency translation rates
(62.1
)
(23.0
)
Other
(1.4
)
(2.0
)
Projected benefit obligation, December 31,
$
373.9

358.5

 
 
 
Change in plan assets:
2016
2015
Fair value of plan assets, January 1,
$
384.9

414.3

Actual return on plan assets
52.6

16.3

Plan contributions
8.4

12.2

Benefits paid
(16.2
)
(10.1
)
Changes in currency translation rates
(63.4
)
(23.4
)
Other
(1.4
)
(24.4
)
Fair value of plan assets, December 31,
$
364.9

384.9

 
 
 
Funded status and net amount recognized
$
(9.0
)
26.4

 
 
 
Accumulated benefit obligation, December 31,
$
373.9

357.3
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)
2016
2015
Pension assets - included in Other long-term assets
$
11.2

30.5

Pension liabilities - included in Other long-term liabilities
(20.2
)
(4.1
)
Net (liability) asset recognized
$
(9.0
)
26.4

 
 
 
Actuarial losses
$
90.8

59.0

Prior service costs
0.6

0.6

Accumulated other comprehensive loss
$
91.2

59.6
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)
2016
2015
2014
Current year actuarial losses (gains)
$
44.2

(25.2
)
57.4

Reclassification adjustments included in Net periodic pension cost
(0.9
)
(4.1
)
(1.2
)
Change in currency translation rates
(11.7
)
(3.5
)
(2.4
)
Total
$
31.6

(32.8
)
53.8
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.
 
2016
 
2015
Discount rate used in determining present values
2.00%
to
2.70%
 
2.50%
to
3.90%
Annual increase in future compensation levels
0.00%
to
3.65%
 
0.00%
to
3.50%
The ranges of assumptions we used in determining net periodic cost (benefit) for the years ended December 31 are presented in the following table.
 
2016
 
2015
 
2014
Discount rate used in determining present values
2.00%
to
3.90%
 
2.25%
to
3.70%
 
4.00%
to
4.65%
Annual increase in future compensation levels
0.00%
to
3.50%
 
0.00%
to
3.50%
 
0.00%
to
3.85%
Expected long-term rate of return on assets
2.00%
to
5.90%
 
2.70%
to
5.80%
 
4.10%
to
7.00%
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, 2016
 
December 31, 2015
($ in millions)
Level 1
Level 2
Level 3
Total
%
 
Level 1
Level 2
Level 3
Total
%
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
U.K. equities
$
26.0

2.5

—

28.5

8
%
 
$
46.9

15.8

—

62.7

16
%
Non-U.K. equities
89.0

14.5

—

103.5

28

 
104.7

22.5

—

127.2

33

Debt securities:
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
121.3

32.8

—

154.1

42

 
91.7

31.7

—

123.4

32

Government and other
14.8

2.7

—

17.5

5

 
7.4

11.6

—

19.0

5

Cash & cash equivalents
6.6

12.1

—

18.7

5

 
3.6

15.9

—

19.5

5

Other
3.6

9.8

29.2

42.6

12

 
1.2

9.4

22.5

33.1

9

Total
$
261.3

74.4

29.2

364.9

100
%
 
$
255.5

106.9

22.5

384.9

100
%
Schedule of Expected Benefit Payments
In addition, pension benefit payments expected to be paid as of December 31, 2016, which reflect expected future service, as appropriate, are presented in the following table.
($ in millions)
Expected future minimum pension benefit payments
2017
$
15.0

2018
15.4

2019
15.9

2020
16.3

2021
16.8

2022 to 2026
91.4

Total
$
170.8