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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Net periodic benefit cost (income) for pension and other postretirement benefits was as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.5

 
$
0.3

 
$
1.1

 
$
0.7

Interest cost
32.5

 
36.3

 
65.0

 
73.0

Expected return on assets
(49.7
)
 
(50.7
)
 
(99.4
)
 
(101.4
)
Amortization of prior service cost
1.1

 
1.1

 
2.2

 
2.1

Amortization of (gain) loss
7.8

 
0.6

 
15.6

 
0.1

Net periodic benefit cost (income)
$
(7.8
)
 
$
(12.4
)
 
$
(15.5
)
 
$
(25.5
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.8

 
$
1.0

 
$
3.6

 
$
2.0

Interest cost
5.6

 
5.1

 
11.2

 
10.1

Amortization of prior service cost (credit)
(16.1
)
 
(18.3
)
 
(32.3
)
 
(36.6
)
Amortization of (gain) loss
0.4

 
(0.4
)
 
0.8

 
(0.7
)
Net periodic benefit cost (income)
$
(8.3
)
 
$
(12.6
)
 
$
(16.7
)
 
$
(25.2
)