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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other comprehensive income (loss):        
Defined benefit plans, tax $ 0.3 $ 0.4 $ 0.6 $ 0.9
Cash flow hedges, tax $ 0.2   $ 0.1