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Debt - Long Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jul. 05, 2019
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Debt Instrument [Line Items] |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2020 - $824.1; 2019 - $820.2) | $ 777.7 | $ 778.4 |
Secured Debt | Term Loan due July 5, 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2020 - $824.1; 2019 - $820.2) | 49.9 | 49.9 | $ 49.9
Senior Notes | 5.0% Senior Notes due September 19, 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2020 - $824.1; 2019 - $820.2) | 279.1 | 279.9 |
Senior Notes | 4.35% Senior Notes due February 15, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2020 - $824.1; 2019 - $820.2) | $ 448.7 | $ 448.6 |

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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=120520924&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=120400017&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=120398452&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=120391452&loc=d3e13212-122682 + Details
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