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PENSION PLANS (Tables)
 12 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Changes in benefit obligation and plan assets
Changes in the benefit obligation and plan assets were as follows:

 
December 31, 2016
 
December 31, 2015
 
($ in millions)
 
($ in millions)
Change in Benefit Obligation
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
Benefit obligation at beginning of year
$
2,458.5

 
$
227.4

 
$
2,685.9

 
$
2,116.5

 
$
66.3

 
$
2,182.8

Service cost
1.3

 
7.6

 
8.9

 
2.1

 
2.2

 
4.3

Interest cost
82.4

 
5.3

 
87.7

 
80.2

 
3.1

 
83.3

Actuarial (gain) loss
88.7

 
20.4

 
109.1

 
(45.8
)
 
1.8

 
(44.0
)
Benefits paid
(132.2
)
 
(3.4
)
 
(135.6
)
 
(205.6
)
 
(2.8
)
 
(208.4
)
Curtailments/settlements
—

 
—

 
—

 
12.6

 
0.1

 
12.7

Plan participant’s contributions
—

 
0.9

 
0.9

 
—

 
—

 
—

Plan amendments
—

 
(1.2
)
 
(1.2
)
 
—

 
—

 
—

Business combination
(32.5
)
 
—

 
(32.5
)
 
498.5

 
171.4

 
669.9

Currency translation adjustments
—

 
(6.0
)
 
(6.0
)
 
—

 
(14.7
)
 
(14.7
)
Benefit obligation at end of year
$
2,466.2

 
$
251.0

 
$
2,717.2

 
$
2,458.5

 
$
227.4

 
$
2,685.9


 
December 31, 2016
 
December 31, 2015
 
($ in millions)
 
($ in millions)
Change in Plan Assets
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
Fair value of plans’ assets at beginning of year
$
1,974.0

 
$
62.5

 
$
2,036.5

 
$
1,915.4

 
$
63.3

 
$
1,978.7

Actual return on plans’ assets
191.5

 
3.5

 
195.0

 
(25.4
)
 
0.4

 
(25.0
)
Employer contributions
6.4

 
2.0

 
8.4

 
77.6

 
1.0

 
78.6

Benefits paid
(132.2
)
 
(3.4
)
 
(135.6
)
 
(205.6
)
 
(2.8
)
 
(208.4
)
Business combination
(27.7
)
 
—

 
(27.7
)
 
212.0

 
10.8

 
222.8

Currency translation adjustments
—

 
1.9

 
1.9

 
—

 
(10.2
)
 
(10.2
)
Fair value of plans’ assets at end of year
$
2,012.0

 
$
66.5

 
$
2,078.5

 
$
1,974.0

 
$
62.5

 
$
2,036.5


 
December 31, 2016
 
December 31, 2015
 
($ in millions)
 
($ in millions)
Funded Status
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
Qualified plans
$
(450.6
)
 
$
(182.6
)
 
$
(633.2
)
 
$
(480.8
)
 
$
(163.5
)
 
$
(644.3
)
Non-qualified plans
(3.6
)
 
(1.9
)
 
(5.5
)
 
(3.7
)
 
(1.4
)
 
(5.1
)
Total funded status
$
(454.2
)
 
$
(184.5
)
 
$
(638.7
)
 
$
(484.5
)
 
$
(164.9
)
 
$
(649.4
)
Amounts recognized in consolidated balance sheets
Amounts recognized in the consolidated balance sheets consisted of:

 
December 31, 2016
 
December 31, 2015
 
($ in millions)
 
($ in millions)
 
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
Accrued benefit in current liabilities
$
(0.4
)
 
$
(0.2
)
 
$
(0.6
)
 
$
(0.4
)
 
$
(0.1
)
 
$
(0.5
)
Accrued benefit in noncurrent liabilities
(453.8
)
 
(184.3
)
 
(638.1
)
 
(484.1
)
 
(164.8
)
 
(648.9
)
Accumulated other comprehensive loss
743.1

 
43.5

 
786.6

 
714.2

 
26.6

 
740.8

Net balance sheet impact
$
288.9

 
$
(141.0
)
 
$
147.9

 
$
229.7

 
$
(138.3
)
 
$
91.4
Schedule of projected and accumulated benefit obligation, and fair value of plan assets
 
December 31,
 
2016
 
2015
 
($ in millions)
Projected benefit obligation
$
2,717.2

 
$
2,685.9

Accumulated benefit obligation
2,685.7

 
2,655.0

Fair value of plan assets
2,078.5

 
2,036.5
Components of net periodic benefit income (loss)
 
Years Ended December 31,

2016
 
2015
 
2014
Components of Net Periodic Benefit Costs (Income)
($ in millions)
Service cost
$
12.3

 
$
7.8

 
$
5.3

Interest cost
87.7

 
83.3

 
86.5

Expected return on plans’ assets
(157.8
)
 
(147.4
)
 
(139.5
)
Amortization of prior service cost
—

 
1.6

 
2.2

Recognized actuarial loss
20.7

 
26.2

 
20.3

Curtailments/settlements
—

 
47.2

 
0.2

Net periodic benefit costs (income)
$
(37.1
)
 
$
18.7

 
$
(25.0
)
 
 
 
 
 
 
Included in Other Comprehensive Loss (Pretax)
 
 
 
 
 
Liability adjustment
$
66.1

 
$
125.4

 
$
138.9

Amortization of prior service costs and actuarial losses
(20.7
)
 
(62.4
)
 
(22.7
)
Assumptions used in calculations
 
U.S. Pension Benefits
 
Foreign Pension Benefits
Weighted-Average Assumptions
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Discount rate—periodic benefit cost
4.4%(1)

 
3.9
%
 
4.5
%
 
2.7
%
 
2.8
%
 
4.8
%
Expected return on assets
7.75
%
 
7.75
%
 
7.75
%
 
6.0
%
 
6.0
%
 
7.50
%
Rate of compensation increase
3.0
%
 
3.0
%
 
3.0
%
 
3.0
%
 
3.0
%
 
3.5
%
Discount rate—benefit obligation
4.1
%
 
4.4
%
 
3.9
%
 
2.3
%
 
2.7
%
 
3.9
%


(1) The discount rate—periodic benefit cost for our domestic qualified pension plan is comprised of the discount rate used to determine interest costs of 3.5% and the discount rate used to determine service costs of 4.6%.
Schedule of Rate of Returns by Asset Class Considered in Setting Long-Term Rate of Return Assumption
The following rates of return by asset class were considered in setting the long-term rate of return assumption:

U.S. equities
9%
 
to
 
13%
Non-U.S. equities
10%
 
to
 
14%
Fixed income/cash
5%
 
to
 
9%
Alternative investments
5%
 
to
 
15%
Absolute return strategies
8%
 
to
 
12%
Pension plan asset allocation by asset class
Our pension plan asset allocation at December 31, 2016 and 2015 by asset class was as follows:

 
Percentage of Plan Assets
Asset Class
2016
 
2015
U.S. equities
19
%
 
4
%
Non-U.S. equities
15
%
 
6
%
Fixed income/cash
35
%
 
47
%
Acquisition plan receivable
—
%
 
10
%
Alternative investments
20
%
 
19
%
Absolute return strategies
11
%
 
14
%
Total
100
%
 
100
%
Target allocation and ranges
As of December 31, 2016, the following target allocation and ranges have been set for each asset class:

Asset Class
Target Allocation
 
Target Range
U.S. equities
27
%
 
19-35
Non-U.S. equities
18
%
 
4-35
Fixed income/cash
29
%
 
20-80
Alternative investments
6
%
 
0-32
Absolute return strategies
20
%
 
10-30
Pension Plan Investments Measured At Fair Value [Text Block]
 The following table summarizes our domestic and foreign defined benefit pension plan assets measured at fair value as of December 31, 2016:

Asset Class
Investments Measured at NAV(1)
 
Quoted Prices
In Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Total
 
 
 
($ in millions)
Equity securities
 
 
 
 
 
 
 
 
 
U.S. equities
$
241.4

 
$
143.2

 
$
—

 
$
—

 
$
384.6

Non-U.S. equities
248.6

 
38.6

 
29.9

 
—

 
317.1

Fixed income/cash


 
 
 
 
 
 
 
 
Cash
—

 
259.6

 
—

 
—

 
259.6

Government treasuries
18.2

 
—

 
169.4

 
—

 
187.6

Corporate debt instruments
51.8

 
0.2

 
129.6

 
—

 
181.6

Asset-backed securities
61.4

 
—

 
36.4

 
—

 
97.8

Alternative investments


 
 
 
 
 
 
 
 
Hedge fund of funds
380.6

 
—

 
—

 
—

 
380.6

Real estate funds
22.5

 
—

 
—

 
—

 
22.5

Private equity funds
16.4

 
—

 
—

 
—

 
16.4

Absolute return strategies
230.7

 
—

 
—

 
—

 
230.7

Total assets
$
1,271.6

 
$
441.6

 
$
365.3

 
$
—

 
$
2,078.5


The following table summarizes our domestic and foreign defined benefit pension plan assets measured at fair value as of December 31, 2015:

Asset Class
Investments Measured at NAV(1)
 
Quoted Prices
In Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Total
 
 
 
($ in millions)
Equity securities
 
 
 
 
 
 
 
 
 
U.S. equities
$
43.2

 
$
36.4

 
$
—

 
$
—

 
$
79.6

Non-U.S. equities
118.2

 
0.8

 
3.7

 
—

 
122.7

Acquisition plan receivable
—

 
—

 
—

 
212.0

 
212.0

Fixed income/cash


 
 
 
 
 
 
 
 
Cash
—

 
60.1

 
—

 
—

 
60.1

Government treasuries
41.7

 
—

 
385.9

 
—

 
427.6

Corporate debt instruments
52.8

 
0.3

 
261.1

 
—

 
314.2

Asset-backed securities
118.6

 
—

 
37.0

 
—

 
155.6

Alternative investments


 
 
 
 
 
 
 
 
Hedge fund of funds
335.6

 
—

 
—

 
—

 
335.6

Real estate funds
27.4

 
—

 
—

 
—

 
27.4

Private equity funds
18.4

 
—

 
—

 
—

 
18.4

Absolute return strategies
283.3

 
—

 
—

 
—

 
283.3

Total assets
$
1,039.2

 
$
97.6

 
$
687.7

 
$
212.0

 
$
2,036.5
Summary of activity for defined benefit plan with significant unobservable inputs
The following table summarizes the activity for our defined benefit pension plans level 3 assets for the year ended December 31, 2016:

 
December 31, 2015
 
Realized
Gain/(Loss)
 
Unrealized Gain/(Loss) Relating to Assets Held at Period End
 
Purchases, Sales, Settlements, and Other
 
Transfers
In/(Out)
 
December 31, 2016
 
($ in millions)
Acquisition plan receivable
$
212.0

 
$
—

 
$
—

 
$
(212.0
)
 
$
—

 
$
—


The following table summarizes the activity for our defined benefit pension plans level 3 assets for the year ended December 31, 2015:

 
December 31, 2014
 
Realized
Gain/(Loss)
 
Unrealized Gain/(Loss) Relating to Assets Held at Period End
 
Purchases, Sales, Settlements, and Other
 
Transfers
In/(Out)
 
December 31, 2015
 
($ in millions)
Acquisition plan receivable
$
—

 
$
—

 
$
—

 
$
212.0

 
$
—

 
$
212.0