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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits, Description [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended March 31,
 
 
Pension Benefits
 
Other Benefits
(in millions)
 
2018
 
2017
 
2018
 
2017
Service cost - benefits earned during the period
 
$
1.9

 
$
1.8

 
$
—

 
$
—

Interest cost on projected benefit obligation
 
6.7

 
7.6

 
—

 
—

Expected return on plan assets
 
(10.8
)
 
(12.1
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
Prior service cost
 
0.2

 
0.2

 
—

 
—

Actuarial net loss (gain)
 
4.2

 
3.5

 
(0.3
)
 
(0.2
)
Net periodic benefit cost
 
$
2.2

 
$
1.0

 
$
(0.3
)
 
$
(0.2
)