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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the three months ended March 31 were as follows:

 
Pension benefits
 
Other retirement benefits
 
Total
($ in millions)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.4

 
$
2.8

 
$
—

 
$
—

 
$
0.4

 
$
2.8

Interest cost
2.4

 
2.3

 
0.1

 
0.1

 
2.5

 
2.4

Expected return on assets
(2.9
)
 
(3.9
)
 
—

 
—

 
(2.9
)
 
(3.9
)
Amortization of prior service credit
—

 
(0.3
)
 
(0.2
)
 
(0.2
)
 
(0.2
)
 
(0.5
)
Recognized actuarial losses (gains)
0.5

 
0.9

 
(0.5
)
 
(0.5
)
 
—

 
0.4

Net periodic benefit cost
$
0.4

 
$
1.8

 
$
(0.6
)
 
$
(0.6
)
 
$
(0.2
)
 
$
1.2


 
Pension benefits
 
Other retirement benefits
 
Total
($ in millions)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
U.S. plans
$
(0.1
)
 
$
1.3

 
$
(0.6
)
 
$
(0.6
)
 
$
(0.7
)
 
$
0.7

International plans
0.5

 
0.5

 
—

 
—

 
0.5

 
0.5

Net periodic benefit cost
$
0.4

 
$
1.8

 
$
(0.6
)
 
$
(0.6
)
 
$
(0.2
)
 
$
1.2