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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Other comprehensive income (loss):        
Defined benefit plans, tax $ 1.7 $ 0.5 $ 14.3 $ 1.4