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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
COMPREHENSIVE INCOME:      
Net income $ 778.8 $ 741.1 $ 1,337.9
Other comprehensive income (loss) net of tax:      
(Increase) decrease in pension and other post-retirement benefits (net of income tax of $2.6, $2.6 and $0.8, respectively) (3.5) (3.7) (1.4)
Total other comprehensive income (loss) (3.5) (3.7) (1.4)
Total comprehensive income 775.3 737.4 1,336.5
Comprehensive income attributable to the non-controlling interest 2.3 4.7 4.9
Comprehensive income attributable to SCC $ 773.0 $ 732.7 $ 1,331.6