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Components of Net Periodic Benefit Cost (Tables)
 6 Months Ended
Jun. 30, 2017
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
(in millions)
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost - benefits earned during the period
 
$
1.9

 
$
1.9

 
$
—

 
$
—

 
$
3.7

 
$
3.8

 
$
—

 
$
—

Interest cost on projected benefit obligation
 
7.6

 
8.2

 
0.1

 
0.1

 
15.2

 
16.4

 
0.1

 
0.1

Expected return on plan assets
 
(12.1
)
 
(12.9
)
 
—

 
—

 
(24.2
)
 
(25.8
)
 
—

 
—

Settlement loss
 
0.3

 
5.8

 
—

 
—

 
0.3

 
5.9

 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost
 
0.2

 
0.2

 
(0.2
)
 
(0.2
)
 
0.4

 
0.4

 
(0.2
)
 
(0.2
)
Actuarial net loss (gain)
 
3.5

 
3.7

 
(0.2
)
 
(0.1
)
 
7.0

 
7.3

 
(0.4
)
 
(0.3
)
Net periodic benefit cost
 
$
1.4

 
$
6.9

 
$
(0.3
)
 
$
(0.2
)
 
$
2.4

 
$
8.0

 
$
(0.5
)
 
$
(0.4
)