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Pension and Other Postemployment Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Defined Benefit Pension Plans [Member]  
Components of Net Periodic Benefit Expense
Defined Benefit Pension Plans
The components of net periodic benefit expense for the nine months ended September 30, 2017 and 2016 were (in millions):
 
2017
 
2016
Service cost
$
7.8

 
$
6.1

Interest cost
5.4

 
5.3

Expected return on plan assets
(2.2
)
 
(2.2
)
Amortization of prior service cost
3.5

 
3.3

Amortization of actuarial losses
4.8

 
3.6

 
$
19.3

 
$
16.1
Postemployment Arrangements [Member]  
Components of Net Periodic Benefit Expense
Postemployment Arrangements
The components of net periodic benefit expense for the nine months ended September 30, 2017 and 2016 were (in millions):
 
2017
 
2016
Service cost
$
3.3

 
$
3.0

Interest cost
2.8

 
2.6

Amortization of prior service cost
2.6

 
2.2

Amortization of actuarial losses
0.8

 
0.8

 
$
9.5

 
$
8.6