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Components of Net Periodic Benefit Cost (Tables)
 9 Months Ended
Sep. 30, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
(in millions)
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost - benefits earned during the period
 
$
1.9

 
$
1.9

 
$
—

 
$
—

 
$
5.7

 
$
5.8

 
$
—

 
$
—

Interest cost on projected benefit obligation
 
8.2

 
8.2

 
—

 
0.1

 
24.6

 
24.5

 
0.1

 
0.2

Expected return on plan assets
 
(12.9
)
 
(12.7
)
 
—

 
—

 
(38.7
)
 
(38.1
)
 
—

 
—

Settlement loss
 
0.1

 
—

 
—

 
—

 
6.0

 
—

 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
—

 
0.1

 
—

 
—

 
—

 
0.1

 
—

 
—

Prior service cost
 
0.2

 
0.2

 
—

 
—

 
0.6

 
0.7

 
(0.2
)
 
—

Actuarial net loss (gain)
 
3.6

 
5.0

 
(0.2
)
 
(0.1
)
 
10.9

 
15.1

 
(0.5
)
 
(0.2
)
Net periodic benefit cost
 
$
1.1

 
$
2.7

 
$
(0.2
)
 
$
—

 
$
9.1

 
$
8.1

 
$
(0.6
)
 
$
—