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Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 22, 2019
Debt Instrument [Line Items] |  |  |  |
Write-off of loan costs | $ 0.0 | $ 18.9 | $ 0.0 |
Leverage Ratio | 1,140,000 |  |  |
Letters of Credit Outstanding, Amount | $ 4.0 | 3.9 |  |
Senior Notes | 550.0 | 550.0 |  | $ 550.0
Long-term Debt, Gross | 1,040.8 | 1,040.8 |  |
Unamortized Debt Issuance Expense | (7.4) | (8.5) |  |
Long-term Debt | 1,033.4 | 1,032.3 |  |
Letters of Credit Outstanding, Amount | 4.0 | 3.9 |  |
Debt Issuance Costs, Gross |  |  |  | 9.1
Write-off of loan costs | $ 0.0 | 18.9 | $ 0.0 |
Debt Issuance Costs, Line of Credit Arrangements, Gross |  |  |  | 0.5
Leverage Ratio | 1,140,000 |  |  |
$490.8 Million Term B Loan Facility, due April 2025 [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured Debt | $ 490.8 | 490.8 |  |
Secured Debt | $ 490.8 | $ 490.8 |  |
$490.8 Million Term B Loan Facility, due April 2025 [Domain] | bank base rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |  |
Basis spread on variable rate borrowings | 0.75% |  |  |
$250 Million Revolving Credit Facility, Due November 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured Debt |  |  |  | 250.0
Secured Debt |  |  |  | $ 250.0
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.625%
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.625%
Debt Issuance Costs, Senior Notes, Gross |  |  |  | $ 8.6
LIBOR [Member] | $490.8 Million Term B Loan Facility, due April 2025 [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75% |  |  |
Basis spread on variable rate borrowings | 1.75% |  |  |
Minimum [Member] | $250 Million Revolving Credit Facility, Due November 2024 [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |  |  |
Basis spread on variable rate borrowings | 1.25% |  |  |
Minimum [Member] | $250 Million Revolving Credit Facility, Due November 2024 [Member] | bank base rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.20% |  |  |
Basis spread on variable rate borrowings | 0.25% |  |  |
Revolving credit facility, unused portion, commitment fee percentage | 0.20% |  |  |
Maximum [Member] | $490.8 Million Term B Loan Facility, due April 2025 [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate During Period | 1.90% |  |  |
Line of Credit Facility, Interest Rate During Period | 1.90% |  |  |
Maximum [Member] | $250 Million Revolving Credit Facility, Due November 2024 [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.25% |  |  |
Basis spread on variable rate borrowings | 2.25% |  |  |
Maximum [Member] | $250 Million Revolving Credit Facility, Due November 2024 [Member] | bank base rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.35% |  |  |
Basis spread on variable rate borrowings | 1.25% |  |  |
Revolving credit facility, unused portion, commitment fee percentage | 0.35% |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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