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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
Net income and comprehensive income $ 3,411.2 $ 1,577.8 $ 1,491.9
Other comprehensive income (loss) net of tax:      
-Decrease (increase) in pension and other post-retirement benefits (net of income tax of $1.2, $(1.9) and $3.7, respectively) (1.7) 1.7 (7.7)
-Derivative instruments classified as cash flow hedge:      
- Unrealized gain (loss) of the period (net of income tax of $0.3 million in 2021) 0.6    
Total other comprehensive income (loss) (1.1) 1.7 (7.7)
Total comprehensive income 3,410.1 1,579.5 1,484.2
Comprehensive income attributable to the non-controlling interest 14.1 7.4 6.1
Comprehensive income attributable to SCC $ 3,396.0 $ 1,572.1 $ 1,478.1