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Debt - Debt Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 22, 2020 | Jul. 05, 2019 | Jun. 07, 2019
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Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2021 - $1,152.1; 2020 - $1,247.8) | $ 1,121.9 | $ 1,172.8 |  |  |
Secured Debt | Term Loan due July 5, 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2021 - $1,152.1; 2020 - $1,247.8) | 0.0 | 49.9 |  | $ 49.9 |
Senior Notes | 5.000% Senior Notes Due September 19, 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2021 - $1,152.1; 2020 - $1,247.8) | $ 276.7 | 278.3 |  |  |
Senior Notes | Senior Notes Payable, 4.35% due 2025 (Fair Value: 2021 – $481.4; 2020 – $499.5) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate, percentage | 4.35% |  |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2021 - $1,152.1; 2020 - $1,247.8) | $ 449.0 | 448.8 |  |  |
Senior Notes | Senior Notes, 2.400 Percent Due September 30, 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate, percentage |  |  | 2.40% |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2021 - $1,152.1; 2020 - $1,247.8) | $ 396.2 | $ 395.8 |  |  |
Subordinated Debt | Subordinated Debentures due 2054 (Fair Value: 2018 – $151.1) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate, percentage |  |  |  |  | 7.375%

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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=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: 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=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: 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=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: 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=120391452&loc=d3e13212-122682 + Details
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