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Long-term Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following table sets forth the components of net periodic benefit cost for the three and six months ended June 30, 2018 and 2017:
 
Three Months Ended June 30,
Six Months Ended June 30,
 
2018
2017
2018
2017
Components of net periodic benefit cost:
 
 
 
 
Net periodic benefit cost:
 
 
 
 
Service cost
$
2.2

$
2.1

$
4.5

$
4.2

Interest cost
3.4

3.3

6.8

6.7

Expected return on plan assets
(4.1
)
(3.5
)
(8.3
)
(7.0
)
Amortization of actuarial loss, net
0.3

0.3

0.6

0.8

Amortization of prior service credit, net
(0.1
)
—

(0.1
)
—

Net periodic benefit cost
$
1.7

$
2.2

$
3.5

$
4.7