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Description of Business, Basis of Presentation and Significant Accounting Policies (Schedule of Impact of Adoption on Opening Financial Statement Balances) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Current assets	$ 1,394.4	$ 1,947.5	$ 1,773.1
Total assets	8,408.9	9,111.2	8,967.6
Current liabilities	$ 1,652.4	2,516.5	2,412.4
Total liabilities		5,833.8	$ 5,708.9
Impact of Adoption | Revenue from Contracts with Customers (Topic 606)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Current assets		174.4
Total assets		143.6
Current liabilities		104.1
Total liabilities		$ 124.9

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