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Summary of Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | $ 6.6 | $ 5.1
Current period provision | 1.6 | 1.4
Amounts acquired |  | 0.6
Amounts written off | (1.4) | (0.5)
Balance at the end of the period | 6.8 | 6.6
Operating Segments | Carlisle Construction Materials |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 2.2 | 2.4
Current period provision | 0.8 | 0.0
Amounts acquired |  | 0.1
Amounts written off | (0.6) | (0.3)
Balance at the end of the period | 2.4 | 2.2
Operating Segments | Carlisle Interconnect Technologies |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 1.6 | 1.0
Current period provision | 0.1 | 0.8
Amounts acquired |  | 0.0
Amounts written off | (0.4) | (0.2)
Balance at the end of the period | 1.3 | 1.6
Operating Segments | Carlisle Fluid Technologies |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 1.1 | 0.5
Current period provision | 0.1 | 0.1
Amounts acquired |  | 0.5
Amounts written off | (0.4) | 0.0
Balance at the end of the period | 0.8 | 1.1
Operating Segments | Carlisle Brake & Friction |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 1.2 | 1.2
Current period provision | 0.6 | 0.0
Amounts acquired |  | 0.0
Amounts written off | 0.0 | 0.0
Balance at the end of the period | 1.8 | 1.2
Corporate |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 0.5 | 0.0
Current period provision | 0.0 | 0.5
Amounts acquired |  | 0.0
Amounts written off | 0.0 | 0.0
Balance at the end of the period | $ 0.5 | $ 0.5

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