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Convertible Notes - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) item $ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Nov. 14, 2013 USD ($)
Convertible Senior Notes 0.375 Percent Due 2018 and Convertible Senior Notes 1.25 Percent Due 2020
Convertible Notes
Number of days within 30 consecutive trading days in which the price of the entity's common stock must exceed the conversion price for the notes to be converted	20 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible	30 days
Percentage of the closing sales price of common stock that the conversion price must exceed in order for the notes to be convertible (as a percent)	130.00%
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period | item	5
Number of consecutive trading days before five consecutive business days during the note measurement period | item	5
Conversion ratio, principal amount of note	1,000
Percentage of the trading price to the product of the last reported sale price of the common stock and the conversion rate, maximum (as a percent)	98.00%
Convertible Senior Notes 0.375 Percent Due 2018
Convertible Notes
Aggregate principal amount of notes				$ 375.0
Interest rate of debt (as a percent)	0.375%	0.375%	0.375%
Aggregate principal amount of notes converted		$ 367.2
Debt exchange expense		54.9
Convertible Senior Notes 0.375 Percent Due 2018 | Director
Convertible Notes
Aggregate principal amount of notes converted		$ 259.0
Convertible Senior Notes 1.25 Percent Due 2020
Convertible Notes
Aggregate principal amount of notes				375.0
Carrying value of notes	$ 18.3		$ 17.4
Interest rate of debt (as a percent)	1.25%	1.25%
Conversion ratio, principal amount of note	0.193207
Conversion ratio, principal amount, denominator	1,000
Conversion price per share (in dollars per share) | $ / shares	$ 51.76
Repurchase price as a percentage of principal	100.00%
Liability on notes on the date of issuance				274.8
Equity component in convertible notes				$ 100.2
Debt discount and issuance costs	$ 0.8		$ 1.7
Aggregate principal amount of notes converted		$ 355.6
Convertible Senior Notes 1.25 Percent Due 2020 | Director
Convertible Notes
Aggregate principal amount of notes converted		$ 274.5

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- Definition

Represents the percentage of the closing sales price of the common stock for at least 20 days within 30 consecutive trading days that the closing sales price of the common stock must exceed the conversion price in order for the debt instruments to be convertible.

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Represents the number of trading days within a period of 30 consecutive trading days the price of the entity's common stock must exceed the applicable conversion price in order for the debt instruments to be convertible.

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Represents the number of consecutive business days immediately after any five consecutive trading day period during the debt instrument measurement period.

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Represents the maximum percentage of the trading price of each debt instrument to the product of the last reported sale price of common stock and the conversion rate of the debt instrument that the trading price must be less than in order for the debt instruments to be convertible.

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Represents the denomination of the principal amount of debt used to state the number of shares that debt can be converted into, and which is used in conversion calculations.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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

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

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

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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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