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Debt - Debt Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jul. 05, 2019 | Jun. 07, 2019 | Dec. 31, 2018
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Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $820.2; 2018 - $911.2) | $ 778.4 |  |  | $ 909.0
Secured Debt | Term Loan due June 29, 2020 (Fair Value: 2018 – $35.0) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $820.2; 2018 - $911.2) | 0.0 |  |  | 34.9
Secured Debt | Term Loan due July 5, 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $820.2; 2018 - $911.2) | $ 49.9 | $ 49.9 |  | 0.0
Senior Notes | 5.0% Senior Notes due September 19, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate, percentage | 5.00% |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $820.2; 2018 - $911.2) | $ 279.9 |  |  | 281.5
Senior Notes | Senior Notes Payable, 4.35% due 2025 (Fair Value: 2019 – $478.6; 2018 – $444.2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate, percentage | 4.35% |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $820.2; 2018 - $911.2) | $ 448.6 |  |  | 448.4
Subordinated Debt | Subordinated Debentures due 2054 (Fair Value: 2018 – $151.1) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate, percentage | 7.375% |  | 7.375% |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $820.2; 2018 - $911.2) | $ 0.0 |  |  | $ 144.2

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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