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Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018
Financial assets recorded at fair value:
Derivative Asset, Fair Value	$ 16.0	$ 12.3
Financial liabilities recorded at fair value:
Derivative Liability, Fair Value	59.5	110.0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Financial assets recorded at fair value:
Derivative Asset, Fair Value	16.0	12.3
Financial liabilities recorded at fair value:
Derivative Liability, Fair Value	59.5	110.0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Financial assets recorded at fair value:
Investments, Fair Value Disclosure	$ 153.6	234.2
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Paper, Included in Short-term Investments [Member]
Financial assets recorded at fair value:
Investments, Fair Value Disclosure		219.2
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Paper, Included in Cash and Cash Equivalents [Member]
Financial assets recorded at fair value:
Investments, Fair Value Disclosure		$ 15.0

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