Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018
Notional Amounts of Derivative Financial Instruments
Notional amount of hedges	$ 1,951.6	$ 2,654.9
Derivative Assets
Derivative Asset, Fair Value	16.0	12.3
Derivative Liabilities
Derivative Liability, Fair Value	59.5	110.0
Designated [Member]
Notional Amounts of Derivative Financial Instruments
Notional amount of hedges	1,764.3	2,195.7
Derivative Assets
Derivative Asset, Fair Value	15.1	1.2
Derivative Liabilities
Derivative Liability, Fair Value	58.8	108.5
Designated [Member] \| Foreign Exchange Forward [Member] \| Other Noncurrent Assets [Member]
Derivative Assets
Foreign Currency Cash Flow Hedge Asset at Fair Value	1.3
Designated [Member] \| Interest Rate Swap [Member]
Notional Amounts of Derivative Financial Instruments
Notional amount of hedges	600.0	600.0
Derivative Assets
Interest Rate Fair Value Hedge Asset at Fair Value	0.0	0.0
Derivative Liabilities
Interest Rate Fair Value Hedge Liability at Fair Value	11.9	12.4
Designated [Member] \| Interest Rate Swap [Member] \| Accrued Expenses and Other Current Liabilities [Member]
Derivative Liabilities
Interest Rate Fair Value Hedge Liability at Fair Value	0.9	1.6
Designated [Member] \| Interest Rate Swap [Member] \| Other Noncurrent Liabilities [Member]
Derivative Liabilities
Interest Rate Fair Value Hedge Liability at Fair Value	11.0	10.8
Undesignated [Member] \| Foreign Exchange Forward [Member]
Notional Amounts of Derivative Financial Instruments
Notional amount of hedges	187.3	459.2
Undesignated [Member] \| Foreign Exchange Forward [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Assets
Derivative Asset, Fair Value	0.9	11.1
Undesignated [Member] \| Foreign Exchange Forward [Member] \| Accrued Expenses and Other Current Liabilities [Member]
Derivative Liabilities
Derivative Liability, Fair Value	0.7	1.5
Cash Flow Hedging [Member] \| Designated [Member] \| Foreign Exchange Forward [Member]
Notional Amounts of Derivative Financial Instruments
Notional amount of hedges	523.6	514.5
Derivative Assets
Foreign Currency Cash Flow Hedge Asset at Fair Value	15.1
Derivative Liabilities
Foreign Currency Cash Flow Hedge Liability at Fair Value		13.5
Cash Flow Hedging [Member] \| Designated [Member] \| Foreign Exchange Forward [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Assets
Foreign Currency Cash Flow Hedge Asset at Fair Value	13.8	1.1
Cash Flow Hedging [Member] \| Designated [Member] \| Foreign Exchange Forward [Member] \| Accrued Expenses and Other Current Liabilities [Member]
Derivative Liabilities
Foreign Currency Cash Flow Hedge Liability at Fair Value	2.4	12.9
Cash Flow Hedging [Member] \| Designated [Member] \| Foreign Exchange Forward [Member] \| Other Noncurrent Liabilities [Member]
Derivative Liabilities
Foreign Currency Cash Flow Hedge Liability at Fair Value		0.6
Net Investment Hedging [Member] \| Designated [Member]
Notional Amounts of Derivative Financial Instruments
Notional amount of hedges	640.7	1,081.2
Derivative Assets
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value	0.0
Derivative Liabilities
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value	44.5	82.6
Net Investment Hedging [Member] \| Designated [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Assets
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value		0.1
Net Investment Hedging [Member] \| Designated [Member] \| Accrued Expenses and Other Current Liabilities [Member]
Derivative Liabilities
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value	26.2	44.8
Net Investment Hedging [Member] \| Designated [Member] \| Other Noncurrent Liabilities [Member]
Derivative Liabilities
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value	$ 18.3	$ 37.8

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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