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Restructuring and Impairment Activities (Tables)
 3 Months Ended
Mar. 31, 2020
Restructuring and Related Activities [Abstract]  
Changes in Restructuring Liabilities Changes in the restructuring liabilities, substantially all of which are employee-related, during the periods ended March 31, 2020 and December 31, 2019 are summarized as follows ($ in millions):
 
Three Months Ended
 
Year Ended
 
March 31,
2020
 
December 31,
2019
Balance at beginning of year
$
0.5

 
$
1.4

Accruals for announced programs
0.1

 
3.7

Cash payments
(0.3
)
 
(4.2
)
Other
—

 
(0.4
)
Balance at end of period
$
0.3

 
$
0.5