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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
December 31 (dollars in millions)20202019
Land$11.6 $11.6 
Buildings349.2 334.1 
Equipment729.7 686.9 
Software132.1 124.3 
1,222.6 1,156.9 
Accumulated depreciation and amortization(681.3)(611.5)
$541.3 $545.4