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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components Of Net Periodic Cost
For all plans, the components of net periodic (benefit) cost for the three months ended June 30, 2018 and 2017 are as follows:
 
Pension
 
Postretirement
 
SERP
(in millions)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
1.5

 
$
1.2

 
$
0.1

 
$
—

 
$
—

 
$
—

Interest cost
7.5

 
7.2

 
0.2

 
0.1

 
0.1

 
—

Expected return on plan assets
(16.4
)
 
(13.9
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
(0.1
)
 
(0.1
)
 
—

 
(0.1
)
 
—

 
—

Amortization of net loss (gain)
3.6

 
3.5

 
(0.3
)
 
(0.1
)
 
—

 
—

Net periodic (benefit) cost
$
(3.9
)
 
$
(2.1
)
 
$
—

 
$
(0.1
)
 
$
0.1

 
$
—
schedule of contributions by benefitplantype [Table Text Block]
The Company expects, based on current actuarial calculations, to contribute the following to its pension plans, postretirement plans and SERP:
(in millions)
Pension
 
Postretirement
 
SERP
Expected contributions in 2018
$
27.0

 
$
2.4

 
$
0.2

Amounts contributed during the six months ended June 30, 2018
$
15.5

 
$
0.9

 
$
0.1