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Investments, Forward Contracts and Fair Value Measurements - Contractual Maturities of Debt Securities (Details) $ in Millions	Jun. 30, 2018 USD ($)
Amortized Cost/Carrying Cost
Amounts maturing in less than 1 year	$ 140.8
Amounts maturing in 1 - 5 years	49.0
Amounts maturing in more than 5 years	1.0
Total debt available-for-sale securities	190.8
Estimated Fair Value
Amounts maturing in less than 1 year	140.5
Amounts maturing in 1 - 5 years	48.4
Amounts maturing in more than 5 years	0.7
Total debt available-for-sale securities	$ 189.6

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