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Income Taxes, Tax Credits and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Gross Unrecognized Tax Benefits, Including Interest | $ 10.1 | $ 10.1 | $ 4.1 | $ 3.9
Reconciliation of the total amounts of unrecognized tax benefits [Roll Forward] |  |  |  |
Balance at January 1 |  | 3.7 | 3.7 | 2.3
Gross Increases - Tax Positions Prior Periods |  | 5.9 | 0.1 | 2.0
Gross Decreases - Tax Positions Prior Periods |  | (0.2) | 0.0 | (0.8)
Gross Increases - Current Period Tax Positions |  | 0.5 | 0.6 | 0.4
Decreases - Settlements with Taxing Authorities |  | (0.2) | (0.1) | 0.0
Reductions - Lapse of Statute of Limitations |  | 0.0 | (0.6) | (0.2)
Balance at December 31 | 9.7 | 9.7 | 3.7 | 3.7
Possible Decrease in Unrecognized Tax Benefits in 2017 | 0.5 | 0.5 |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax Credit Carryforward, Amount | 57.6 | 57.6 |  |
Tax Credit Carryforwards | 57.6 | 57.6 | 51.1 |
Gross Unrecognized Tax Benefits, Including Interest | 10.1 | 10.1 | 4.1 | 3.9
Income Tax Provision |  | 141.0 | $ 98.0 | $ 80.3
SEC Schedule, 12-09, Valuation Allowance, Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income Tax Provision | (21.0) |  |  |
Acquisition-related Costs |  |  |  |
Income Tax Disclosure [Abstract] |  |  |  |
Gross Unrecognized Tax Benefits, Including Interest | 5.5 | 5.5 |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Gross Unrecognized Tax Benefits, Including Interest | 5.5 | 5.5 |  |
General Business Credits [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax Credit Carryforwards | 12.9 | 12.9 |  |
State Tax Credits [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax Credit Carryforwards | $ 44.7 | $ 44.7 |  |

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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
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