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Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Components of Accumulated Other Comprehensive Income Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
June 30, 2021December 31, 2020
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $11.7 million and $11.6 million at June 30, 2021 and December 31, 2020, respectively
$(18.0)$(20.5)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.6 million and $2.8 million at June 30, 2021 and December 31, 2020, respectively
(9.5)(13.1)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $6.8 million and $10.1 million at June 30, 2021 and December 31, 2020, respectively
(78.8)(78.3)
Accumulated other comprehensive loss$(106.3)$(111.9)
Changes in Components of Other Comprehensive Income
Changes in the components of Accumulated other comprehensive income (loss) were as follows ($ in millions):
Three Months Ended
June 30, 2021June 30, 2020
Pre-taxTaxNet of
Tax		Pre-taxTaxNet of
Tax
Net gain (loss) on pension and OPEB liability adjustments$1.2 $(0.4)$0.8 $1.1 $(0.3)$0.8 
Unrealized (loss) gain on derivative instruments(2.6)1.8 (0.8)0.2 (0.3)(0.1)
Unrealized gain (loss) on foreign currency translation9.3 0.1 9.4 (0.8)1.4 0.6 
Total$7.9 $1.5 $9.4 $0.5 $0.8 $1.3 
Six Months Ended
June 30, 2021June 30, 2020
Pre-taxTaxNet of
Tax		Pre-taxTaxNet of
Tax
Unrealized gain (loss) on pension and OPEB liability adjustments$2.3 $0.2 $2.5 $1.8 $(0.5)$1.3 
Unrealized gain (loss) on derivative instruments3.8 (0.2)3.6 (15.4)2.6 (12.8)
Unrealized gain (loss) on foreign currency translation2.8 (3.3)(0.5)(4.9)2.0 (2.9)
Total$8.9 $(3.3)$5.6 $(18.5)$4.1 $(14.4)