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Long-Term Debt - Credit Facility (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 08, 2019	Apr. 30, 2018	Mar. 31, 2018	Feb. 28, 2018
Credit Facility
Line of Credit Facility
Letter of credit outstanding	$ 12.4
Debt instrument, variable rate (percentage)	2.40%
Debt instrument weighted average interest rate (percent)	2.70%	4.30%
Current borrowing capacity	$ 444.1
Undrawn capacity under revolving credit facility	844.6
Issuance costs				$ 6.4			$ 3.3
Maximum borrowing capacity	1,250.0				$ 1,250.0	$ 1,100.0
Contingent increase in borrowing capacity	$ 250.0
Line of credit facility, commitment fee (percent)	0.375%
Commitment fee amount	$ 2.0	$ 1.9	$ 2.1
Credit Facility | LIBOR | Minimum
Line of Credit Facility
Debt instrument, variable rate (percentage)	2.00%
Credit Facility | LIBOR | Maximum
Line of Credit Facility
Debt instrument, variable rate (percentage)	2.75%
Credit Facility | Base Rate | Minimum
Line of Credit Facility
Debt instrument, variable rate (percentage)	1.00%
Credit Facility | Base Rate | Maximum
Line of Credit Facility
Debt instrument, variable rate (percentage)	1.75%
Credit Facility | Federal Funds Rate
Line of Credit Facility
Debt instrument, interest margin added to variable rate	0.50%
Credit Facility | One-month LIBOR
Line of Credit Facility
Debt instrument, interest margin added to variable rate	1.00%
Letters of Credit, Credit Facility
Line of Credit Facility
Maximum borrowing capacity					$ 50.0	$ 25.0
Swing Line Loans, Credit Facility
Line of Credit Facility
Maximum borrowing capacity	$ 50.0

X

- Definition

The interest margin added to the calculated variable rate of the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

+ References

No definition available.

+ Details

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X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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X

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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