Financing - Subsequent Events (Details) - Subsequent Event	Feb. 22, 2019 USD ($) $ / shares	Feb. 19, 2019 $ / shares
Subsequent Event [Line Items]
Closing price (usd per share) \| $ / shares		$ 80.48
Senior Unsecured Notes due 2022 \| Convertible Debt
Subsequent Event [Line Items]
Aggregate principal amount \| $	$ 1,437,000,000
Interest rate	0.875%
Conversion ratio	0.093777
Conversion price \| $ / shares	$ 106.64
Conversion price, premium		32.50%
Senior Unsecured Notes due 2022 \| Convertible Debt \| Debt Instrument, Redemption, Period One
Subsequent Event [Line Items]
Redemption price, percentage	100.00%
Senior Unsecured Notes due 2022 \| Convertible Debt \| Debt Instrument, Redemption, Period Two
Subsequent Event [Line Items]
Redemption price, percentage	100.00%
Aggregate principal amount of outstanding notes, percentage	25.00%
Senior Unsecured Notes due 2022, Over-Allotment Option \| Convertible Debt
Subsequent Event [Line Items]
Aggregate principal amount \| $	$ 187,500,000

Debt Instrument, Trustee or Holders, Amount Outstanding, Percentage

No definition available.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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