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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
Net income and comprehensive income $ 2,648.0 $ 3,411.2 $ 1,577.8
Other comprehensive income (loss) net of tax:      
-Decrease (increase) in pension and other post-retirement benefits (net of income tax of $(0.2), $1.2 and $(1.9), respectively) 1.0 (1.7) 1.7
- Unrealized gain on derivative instruments classified as cash flow hedge (net of income tax of $0.2 million in 2022 and $0.3 million in 2021) (0.6) 0.6  
Total other comprehensive income (loss) 0.4 (1.1) 1.7
Total comprehensive income 2,648.4 3,410.1 1,579.5
Comprehensive income attributable to the non-controlling interest 9.5 14.1 7.4
Comprehensive income attributable to SCC $ 2,638.9 $ 3,396.0 $ 1,572.1