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Pension and Other Postemployment Benefits (Tables)
 12 Months Ended
Dec. 31, 2018
Defined Benefit Pension Plans [Member]  
Components of Net Periodic Benefit Expense
The components of net periodic benefit expense for the three years ended December 31, 2018 were (in millions)
 
2018
 
2017
 
2016
Service cost
$
7.7

 
$
10.1

 
$
7.8

Interest cost
7.9

 
7.9

 
7.8

Expected return on plan assets
(2.8
)
 
(3.6
)
 
(3.7
)
Amortization of prior service cost
4.4

 
4.6

 
4.5

Amortization of actuarial losses
6.9

 
7.0

 
5.3

 
$
24.1

 
$
26.0

 
$
21.7
Weighted Average Assumptions Used to Determine Net Periodic Benefit Expense
The weighted average assumptions used to determine net periodic benefit expense for the three years ended December 31, 2018 were:
 
2018
 
2017
 
2016
Discount rate
3.6
%
 
3.5
%
 
3.7
%
Compensation increases
2.5
%
 
2.0
%
 
2.0
%
Expected return on plan assets
5.8
%
 
5.3
%
 
4.8
%
Benefit Obligation, Fair Value of Plan Assets and Funded Status of Defined Benefit Pension Plans
At December 31, 2018 and 2017, the benefit obligation, fair value of plan assets and funded status of our defined benefit pension plans were (in millions):
 
2018
 
2017
Benefit Obligation:
 
 
 
January 1
$
277.0

 
$
251.1

Service cost
7.7

 
10.1

Interest cost
7.9

 
7.9

Amendments, curtailments and settlements
0.1

 
0.3

Actuarial losses (gains)
(16.0
)
 
6.8

Benefits paid
(23.1
)
 
(9.1
)
Foreign currency translation
4.8

 
9.9

December 31
$
258.4

 
$
277.0

Fair Value of Plan Assets:
 
 
 
January 1
$
80.3

 
$
68.6

Actual return on plan assets
(4.7
)
 
6.3

Employer contributions
8.0

 
8.3

Benefits paid
(23.1
)
 
(9.1
)
Foreign currency translation and other
(3.1
)
 
6.2

December 31
$
57.4

 
$
80.3

 
 
 
 
Funded Status December 31
$
(201.0
)
 
$
(196.7
)
Defined Benefit Pension Plan Liability, as Classified
At December 31, 2018 and 2017, the funded status was classified as follows (in millions):
 
2018
 
2017
Other assets
$
2.5

 
$
6.0

Other current liabilities
(5.1
)
 
(5.1
)
Long-term liabilities
(198.4
)
 
(197.6
)
 
$
(201.0
)
 
$
(196.7
)
Plans with Benefit Obligations in Excess of Plan Assets
At December 31, 2018 and 2017, plans with benefit obligations in excess of plan assets were (in millions):
 
2018
 
2017
Benefit obligation
$
(247.0
)
 
$
(253.8
)
Plan assets
43.5

 
51.1

 
$
(203.5
)
 
$
(202.7
)
Weighted Average Assumptions Used to Determine Benefit Obligation
The weighted average assumptions used to determine the benefit obligation at December 31, 2018 and 2017, were:
 
2018
 
2017
Discount rate
3.6
%
 
3.1
%
Compensation increases
2.7
%
 
2.0
%
Estimated Future Benefit Payments
At December 31, 2018, the estimated benefits expected to be paid over the next 10 years are (in millions):
2019
$
8.9

2020
12.0

2021
14.1

2022
15.7

2023
17.0

2024 - 2028
96.0
Postemployment Arrangements [Member]  
Components of Net Periodic Benefit Expense
The components of net periodic benefit expense for the three years ended December 31, 2018 were (in millions):
 
2018
 
2017
 
2016
Service cost
$
4.7

 
$
4.4

 
$
3.9

Interest cost
3.6

 
3.7

 
3.5

Amortization of prior service cost
3.5

 
3.5

 
3.1

Amortization of actuarial losses
1.8

 
1.0

 
1.1

 
$
13.6

 
$
12.6

 
$
11.6
Weighted Average Assumptions Used to Determine Net Periodic Benefit Expense
The weighted average assumptions used to determine net periodic benefit expense for the three years ended December 31, 2018 were:
 
2018
 
2017
 
2016
Discount rate
3.4
%
 
3.9
%
 
4.1
%
Compensation increases
3.5
%
 
3.5
%
 
3.5
%
Benefit Obligation
At December 31, 2018 and 2017, the benefit obligation was (in millions):
 
2018
 
2017
January 1
$
127.7

 
$
120.3

Service cost
4.7

 
4.4

Interest cost
3.6

 
3.7

Amendments
6.5

 
—

Actuarial (gain) loss
(7.9
)
 
8.1

Benefits paid
(8.1
)
 
(8.8
)
December 31
$
126.5

 
$
127.7
Defined Benefit Pension Plan Liability, as Classified
At December 31, 2018 and 2017, the liability was classified as follows (in millions):
 
2018
 
2017
Other current liabilities
$
7.7

 
$
9.3

Long-term liabilities
118.8

 
118.4

 
$
126.5

 
$
127.7
Weighted Average Assumptions Used to Determine Benefit Obligation
The weighted average assumptions used to determine the benefit obligation at December 31, 2018 and 2017 were:
 
2018
 
2017
Discount rate
4.0
%
 
3.4
%
Compensation increases
3.5
%
 
3.5
%
Estimated Future Benefit Payments
At December 31, 2018, the estimated benefits expected to be paid over the next 10 years are (in millions):
2019
$
7.8

2020
7.6

2021
7.2

2022
7.6

2023
7.4

2024 - 2028
39.8