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Other Comprehensive Loss (Tables)
3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Components of Accumulated Other Comprehensive Income
Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
March 31, 2021December 31, 2020
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $12.2 million and $11.6 million at March 31, 2021 and December 31, 2020, respectively
$(18.8)$(20.5)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.8 million and $2.8 million at March 31, 2021 and December 31, 2020, respectively
(8.7)(13.1)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $6.8 million and $10.1 million at March 31, 2021 and December 31, 2020, respectively
(88.2)(78.3)
Accumulated other comprehensive loss$(115.7)$(111.9)
Changes in Components of Other Comprehensive Income
Changes in the components of Accumulated other comprehensive (loss) income were as follows ($ in millions):
Three Months Ended
March 31, 2021March 31, 2020
Pre-taxTaxNet of
Tax
Pre-taxTaxNet of
Tax
Net gain (loss) on pension and OPEB liability adjustments$1.1 $0.6 $1.7 $0.7 $(0.2)$0.5 
Unrealized gain (loss) on derivative instruments4.5 (0.1)4.4 (15.6)2.9 (12.7)
Unrealized (loss) gain on foreign currency translation(6.5)(3.4)(9.9)(4.1)0.6 (3.5)
Total$(0.9)$(2.9)$(3.8)$(19.0)$3.3 $(15.7)