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Financial Instruments (Forward Contracts) (Details) € in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2018 AUD ($) | Mar. 31, 2018 CAD ($) | Mar. 31, 2018 EUR (€) | Mar. 31, 2018 GBP (£) | Mar. 31, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Remaining maturity of forward foreign exchange contracts, maximum |  | 18 months |  |  |  |  |
Foreign currency cash flow hedge gain (loss) to be reclassified during next 12 months |  | $ (0.7) |  |  |  |  |
British Pound Sterling | Foreign Exchange Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Foreign Currency Amount | £ |  |  |  |  |  | £ 20.8 |
US Dollar Amount |  | $ 29.0 |  |  |  |  |
Weighted average exchange rate per $1 USD |  | 0.72 | 0.72 | 0.72 | 0.72 | 0.72 |
Euro Member Countries, Euro | Foreign Exchange Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Foreign Currency Amount | € |  |  |  |  | € 1.5 |  |
US Dollar Amount |  | $ 1.7 |  |  |  |  |
Weighted average exchange rate per $1 USD |  | 0.87 | 0.87 | 0.87 | 0.87 | 0.87 |
Canadian Dollar | Foreign Exchange Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Foreign Currency Amount |  |  |  | $ 15.1 |  |  |
US Dollar Amount |  | $ 12.1 |  |  |  |  |
Weighted average exchange rate per $1 USD |  | 1.25 | 1.25 | 1.25 | 1.25 | 1.25 |
Australia, Dollars | Foreign Exchange Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Foreign Currency Amount |  |  | $ 4.1 |  |  |  |
US Dollar Amount |  | $ 3.2 |  |  |  |  |
Weighted average exchange rate per $1 USD |  | 1.27 | 1.27 | 1.27 | 1.27 | 1.27 |
Other Assets | Foreign Exchange Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative asset | [1] | $ 0.3 |  |  |  |  | $ 0.6
Accounts Payable and Accrued Liabilities | Foreign Exchange Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative liability | [1] | $ 0.6 |  |  |  |  | $ 0.5
[1] | Includes an immaterial amount of forward foreign exchange contracts not designated as hedging instruments as of March 31, 2018 and 2017.

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