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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Defined Benefit Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Period Benefit Costs
Components of defined benefit pension plan net periodic gains are as follows: 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(In millions)
2016

2015
 
2016
 
2015
Service cost
$
0.3

 
$
0.5

 
$
0.5

 
$
0.9

Interest cost
5.2

 
5.4

 
10.4

 
10.7

Expected return on plan assets
(7.8
)
 
(8.2
)
 
(15.7
)
 
(16.4
)
Net periodic benefit gains
$
(2.3
)
 
$
(2.3
)
 
$
(4.8
)
 
$
(4.8
)
Post-retirement Health Care Plan Benefit  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Period Benefit Costs
Components of post-retirement health care plan benefit costs are as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(In millions)
2016
 
2015
 
2016
 
2015
Interest cost
$
0.1

 
$
0.2

 
$
0.2

 
$
0.3

Net periodic benefit costs
$
0.1

 
$
0.2

 
$
0.2

 
$
0.3