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Other Comprehensive (Loss) Income (Tables)
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
September 30, 2021December 31, 2020
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $11.6 million and $11.6 million at September 30, 2021 and December 31, 2020, respectively
$(17.1)$(20.5)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.1 million and $2.8 million at September 30, 2021 and December 31, 2020, respectively
(7.8)(13.1)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $6.6 million and $10.1 million at September 30, 2021 and December 31, 2020, respectively
(99.0)(78.3)
Accumulated other comprehensive loss$(123.9)$(111.9)
Changes in Components of Other Comprehensive (Loss) Income
Changes in the components of Accumulated other comprehensive (loss) income were as follows ($ in millions):
Three Months Ended
September 30, 2021September 30, 2020
Pre-taxTaxNet of
Tax		Pre-taxTaxNet of
Tax
Net gain (loss) on pension and OPEB liability adjustments$1.1 $(0.2)$0.9 $1.1 $(0.3)$0.8 
Unrealized gain (loss) on derivative instruments2.3 (0.6)1.7 1.1 (0.3)0.8 
Unrealized (loss) gain on foreign currency translation(20.1)(0.1)(20.2)5.5 1.7 7.2 
Total$(16.7)$(0.9)$(17.6)$7.7 $1.1 $8.8 
Nine Months Ended
September 30, 2021September 30, 2020
Pre-taxTaxNet of
Tax		Pre-taxTaxNet of
Tax
Unrealized gain (loss) on pension and OPEB liability adjustments$3.4 $— $3.4 $2.9 $(0.8)$2.1 
Unrealized gain (loss) on derivative instruments6.1 (0.8)5.3 (14.3)2.3 (12.0)
Unrealized (loss) gain on foreign currency translation(17.3)(3.4)(20.7)0.6 3.7 4.3 
Total$(7.8)$(4.2)$(12.0)$(10.8)$5.2 $(5.6)