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Acquisitions Acquired Intangibles, Amortization Expense Next Five Years (Details)
$ in Millions
Feb. 23, 2018
USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]  
Amortization expense, 2019 $ 3.6
Amortization expense, 2020 3.4
Amortization expense, 2021 3.4
Amortization expense, 2022 3.4
Amortization expense, 2023 3.3
Amortization Expense, 2019-2023 Total 17.1
AMQ Acquisition Q4 2018 [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Amortization expense, 2019 3.2
Amortization expense, 2020 3.1
Amortization expense, 2021 3.0
Amortization expense, 2022 3.0
Amortization expense, 2023 3.0
Amortization Expense, 2019-2023 Total $ 15.3