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Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block] The following tables present the fair value hierarchy for those assets and liabilities on the Consolidated Balance Sheets measured at fair value on a recurring basis as of December 31, 2017 and 2016:
 
December 31, 2017
  
Total
Level 1
Level 2
Level 3
Assets:
 
 
 
 
Cash and cash equivalents
$
108.5

$
107.3

$
1.2

$
—

Cash and cash equivalents measured at net
asset value
13.1







Restricted cash
3.8

3.8

—

—

Short-term investments
16.2

—

16.2

—

Short-term investments measured at net asset value
0.2







Foreign currency hedges
1.3

—

1.3

—

Total Assets
$
143.1

$
111.1

$
18.7

$
—

 
 
 
 
 
Liabilities:
 
 
 
 
Foreign currency hedges
$
7.1

$
—

$
7.1

$
—

Total Liabilities
$
7.1

$
—

$
7.1

$
—


 
December 31, 2016
  
Total
Level 1
Level 2
Level 3
Assets:
 
 
 
 
Cash and cash equivalents
$
129.6

$
125.0

$
4.6

$
—

Cash and cash equivalents measured at net
asset value
19.2







Restricted cash
2.7

2.7

—

—

Short-term investments
9.4

—

9.4

—

Short-term investments measured at net asset value
2.3







Foreign currency hedges
9.9

—

9.9

—

Total Assets
$
173.1

$
127.7

$
23.9

$
—

 
 
 
 
 
Liabilities:
 
 
 
 
Foreign currency hedges
$
2.1

$
—

$
2.1

$
—

Total Liabilities
$
2.1

$
—

$
2.1

$
—
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Projected Benefit Obligations [Table Text Block] The following tables set forth the change in benefit obligation, change in plan assets, funded status and amounts recognized on the Consolidated Balance Sheets for the defined benefit pension plans as of December 31, 2017 and 2016:
 
U.S. Plans
International Plans
 
2017
2016
2017
2016
Change in benefit obligation:
 
 
 
 
Benefit obligation at beginning of year
$
612.4

$
589.9

$
314.2

$
338.1

Service cost
12.2

13.1

1.6

1.4

Interest cost
24.6

26.6

7.5

10.5

Plan amendments
2.8

—

—

—

Actuarial losses
60.5

45.3

0.9

53.4

International plan exchange rate change
—

—

32.2

(45.0
)
Curtailment
(1.8
)
—

—

(0.1
)
Benefits paid
(67.7
)
(62.5
)
(21.2
)
(44.1
)
Benefit obligation at end of year
$
643.0

$
612.4

$
335.2

$
314.2
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Change in plan assets:
 
 
 
 
Fair value of plan assets at beginning of year
$
529.6

$
553.7

$
268.7

$
304.6

Actual return on plan assets
65.5

33.8

12.0

43.2

Company contributions / payments
4.5

4.6

7.0

10.4

International plan exchange rate change
—

—

25.9

(45.4
)
Benefits paid
(67.7
)
(62.5
)
(21.2
)
(44.1
)
Fair value of plan assets at end of year
531.9

529.6

292.4

268.7

Funded status at end of year
$
(111.1
)
$
(82.8
)
$
(42.8
)
$
(45.5
)
Net periodic benefit cost for the Company's retirement benefit plans The following tables summarize the net periodic benefit cost information and the related assumptions used to measure the net periodic benefit cost for the years ended December 31:
 
U.S. Plans
International Plans
 
2017
2016
2015
2017
2016
2015
Components of net periodic benefit cost:
 
 
 
 
 
 
Service cost
$
12.2

$
13.1

$
15.4

$
1.6

$
1.4

$
2.2

Interest cost
24.6

26.6

45.6

7.5

10.5

12.3

Expected return on plan assets
(28.0
)
(30.1
)
(66.9
)
(11.1
)
(10.7
)
(18.2
)
Amortization of prior service cost
1.4

1.7

2.8

—

0.1

0.1

Recognition of net actuarial
losses (gains)
23.1

41.5

(3.4
)
0.1

19.4

(17.7
)
Curtailment
(1.1
)
—

—

—

(0.1
)
0.6

Settlement
—

—

116.1

—

—

—

Special termination benefits
—

—

—

—

—

0.6

Net periodic benefit cost
$
32.2

$
52.8

$
109.6

$
(1.9
)
$
20.6

$
(20.1
)
Defined Benefit Plans Amounts recognized on the Consolidated Balance Sheets
 
U.S. Plans
International Plans
 
2017
2016
2017
2016
Amounts recognized on the Consolidated Balance Sheets:
 
 
 
 
Non-current assets
$
6.7

$
26.4

$
13.0

$
5.7

Current liabilities
(4.8
)
(4.3
)
(1.5
)
(1.4
)
Non-current liabilities
(113.0
)
(104.9
)
(54.3
)
(49.8
)
 
$
(111.1
)
$
(82.8
)
$
(42.8
)
$
(45.5
)
Defined Benefit Plans Amounts recognized in accumulated other comprehensive income
Amounts recognized in accumulated other comprehensive loss:
 
 
 
 
Net prior service cost
$
8.1

$
7.4

$
0.5

$
0.5

Accumulated other comprehensive loss
$
8.1

$
7.4

$
0.5

$
0.5

Changes in prior service cost recognized in accumulated other comprehensive loss:
 
 
 
 
Accumulated other comprehensive loss at beginning of year
$
7.4

$
9.1

$
0.5

$
0.5

Prior service cost
2.8

—

—

—

Recognized prior service cost
(1.4
)
(1.7
)
—

(0.1
)
(Loss) gain recognized due to curtailment
(0.7
)
—

—

0.1

Total recognized in accumulated other comprehensive loss at December 31
$
8.1

$
7.4

$
0.5

$
0.5
Target assets allocation and actual asset allocations for US pension plan assets The Company’s target allocation for pension plan assets, as well as the actual pension plan asset allocations as of December 31, 2017 and 2016, was as follows: 
 
Current Target
Allocation
Percentage of Pension Plan
Assets at December 31,
Asset Category
 
 
 
2017
2016
Equity securities
10%
to
16%
14%
12%
Fixed income securities
70%
to
90%
80%
78%
Other investments
4%
to
10%
6%
10%
Total
 
 
 
100%
100%
Fair Value, Assets Measured on Recurring Basis [Table Text Block] The following table presents the fair value hierarchy for those investments of the Company’s pension assets measured at fair value on a recurring basis as of December 31, 2016:
 
U.S. Pension Plans
International Pension Plans
 
Level 1
Level 2
Level 3
Total
Level 1
Level 2
Level 3
Total
Assets:
 
 
 
 
 
 
 
 
Cash and cash equivalents
$
34.3

$
—

$
—

$
34.3

$
0.8

$
—

$
—

$
0.8

Government and agency securities
44.0

2.6

—

46.6

—

—

—

—

Corporate bonds - investment grade
—

65.7

—

65.7

—

—

—

—

Equity securities - U.S. companies
10.5

—

—

10.5

—

—

—

—

Equity securities - international companies
6.2

—

—

6.2

—

—

—

—

Mutual funds
41.5

—

—

41.5

—

—

—

—

 
$
136.5

$
68.3

$
—

$
204.8

$
0.8

$
—

$
—

$
0.8

 
 
 
 
 
 
 
 
 
Investments measured at net asset value:
 
 
 
 
 
 
 
 
Cash and cash equivalents
 
 
 
$
—

 
 
 
$
3.4

Corporate bonds - investment grade
 
 
 
—

 
 
 
2.7

Equity securities - international companies
 
 
 
—

 
 
 
1.5

Common collective funds - domestic equities
 
 
 
14.0

 
 
 
—

Common collective funds - international equities
 
 
 
14.1

 
 
 
33.4

Common collective funds - fixed income
 
 
 
217.1

 
 
 
74.6

Limited partnerships
 
 
 
39.6

 
 
 
—

Real estate partnerships
 
 
 
22.1

 
 
 
—

Other assets
 
 
 
—

 
 
 
152.3

Risk parity
 
 
 
17.9

 
 
 
—

 Total Assets
 
 
 
$
529.6

 
 
 
$
268.7


The following table presents the fair value hierarchy for those investments of the Company’s pension assets measured at fair value on a recurring basis as of December 31, 2017:
 
U.S. Pension Plans
International Pension Plans
 
Level 1
Level 2
Level 3
Total
Level 1
Level 2
Level 3
Total
Assets:
 
 
 
 
 
 
 
 
Cash and cash equivalents
$
27.2

$
—

$
—

$
27.2

$
4.8

$
—

$
—

$
4.8

Government and agency securities
15.5

3.4

—

18.9

—

—

—

—

Corporate bonds - investment grade
—

105.1

—

105.1

—

—

—

—

Mutual funds - fixed income
44.9

—

—

44.9

—

—

—

—

Mutual funds - international equity
17.5

—

—

17.5

—

—

—

—

 
$
105.1

$
108.5

$
—

$
213.6

$
4.8

$
—

$
—

$
4.8

 
 
 
 
 
 
 
 
 
Investments measured at net asset value:
 
 
 
 
 
 
 
 
Cash and cash equivalents
 
 
 
$
0.2

 
 
 
$
0.1

Corporate bonds - investment grade
 
 
 
—

 
 
 
5.3

Equity securities - international companies
 
 
 
—

 
 
 
1.0

Common collective funds - domestic equities
 
 
 
37.0

 
 
 
—

Common collective funds - international equities
 
 
 
11.5

 
 
 
25.3

Common collective funds - fixed income
 
 
 
220.9

 
 
 
86.2

Limited partnerships
 
 
 
31.8

 
 
 
—

Real estate partnerships
 
 
 
16.9

 
 
 
—

Other assets
 
 
 
—

 
 
 
169.7

 Total Assets

 
 
$
531.9

 
 
 
$
292.4
Employer contributions to defined benefit plans
Employer Contributions to Defined Benefit Plans
 
2016
$
15.0

2017
11.5

2018 (planned)
10.4
Future pension benefit payments Future benefit payments, including lump sum distributions, are expected to be as follows:
Benefit Payments
 
2018
$
67.4

2019
94.0

2020
64.6

2021
72.2

2022
65.2

2023-2027
300.4
Schedule of Assumptions Used [Table Text Block]
Assumptions
2017
2016
2015
U.S. Plans:
 
 
 
Discount rate
4.34% to 4.50%
4.50% to 4.70%
3.98% to 4.64%

Future compensation assumption
2.50% to 3.00%
2.50% to 3.00%
2.00% to 3.00%

Expected long-term return on plan assets
5.75% to 6.50%
5.75% to 6.75%
6.00
%
International Plans:
 
 
 
Discount rate
1.25% to 9.00%
2.00% to 8.50%
1.50% to 8.75%

Future compensation assumption
2.00% to 8.00%
2.20% to 8.00%
2.20% to 8.00%

Expected long-term return on plan assets
0.75% to 9.25%
0.82% to 9.25%
2.25% to 9.25%

The following table summarizes assumptions used to measure the benefit obligation for the defined benefit pension plans at December 31:
Assumptions
2017
2016
U.S. Plans:
 
 
Discount rate
3.75% to 3.80%

4.34% to 4.50%
Future compensation assumption
2.50
%
2.00% to 3.00%
International Plans:
 
 
Discount rate
1.25% to 9.00%

1.25% to 9.00%
Future compensation assumption
2.00% to 8.00%

2.00% to 8.00%