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Revenue Recognition - Change in Contract with Customer, Asset and Liability (Details)
$ in Millions
12 Months Ended
Mar. 31, 2019
USD ($)
Contract Assets  
Contract assets, beginning balance $ 0.7
Contract assets, additions 3.7
Contract assets, deductions (1.8)
Contract assets, ending balance 2.6
Contract Liabilities  
Contract liabilities, beginning balance 3.2
Contract liabilities, additions 15.3
Contract liabilities, deductions (13.4)
Contract liabilities, ending balance $ 5.1