Derivative Financial Instruments and Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments and Concentrations of Credit Risk	Derivative Financial Instruments and Concentrations of Credit Risk Interest Rate Swaps In March 2018, we entered into interest rate swap agreements (“Initial Swaps”) that had an initial notional amount of $260.0 and maturities through March 2021 and effectively convert a portion of the borrowings under our senior credit facilities to a fixed rate of 2.535%, plus the applicable margin. As of December 31, 2020, the aggregate notional amount of the Initial Swaps was $234.0. In February 2020, and as a result of a December 2019 amendment that extended the maturity date of our senior credit facilities to December 17, 2024, we entered into additional interest swap agreements (“Additional Swaps”). The Additional Swaps have a notional amount of $248.4, cover the period from March 2021 to November 2024, and will effectively convert borrowings under our senior credit facilities to a fixed rate of 1.061%, plus the applicable margin. We have designated and are accounting for our interest rate swap agreements as cash flow hedges. As of December 31, 2020 and 2019, the unrealized loss, net of tax, recorded in AOCI was $5.9 and $1.9 as of December 31, 2020 and 2019, respectively. In addition, as of December 31, 2020, the fair value of our interest rate swap agreements totaled $7.8, with $1.4 recorded as a current liability and the remainder in long-term liabilities, and $2.5 at December 31, 2019 (all of which is recorded in long-term liabilities). Changes in fair value of our interest rate swap agreements are reclassified into earnings as a component of interest expense, when the forecasted transaction impacts earnings. Currency Forward Contracts We manufacture and sell our products in a number of countries and, as a result, are exposed to movements in foreign currency exchange rates. Our objective is to preserve the economic value of non-functional-currency denominated cash flows and to minimize the impact of changes as a result of currency fluctuations. Our principal currency exposures relate to the South African Rand, British Pound Sterling, and Euro. From time to time, we enter into forward contracts to manage the exposure on contracts with forecasted transactions denominated in non-functional currencies and to manage the risk of transaction gains and losses associated with assets/liabilities denominated in currencies other than the functional currency of certain subsidiaries (“FX forward contracts”). None of our FX forward contracts are designated as cash flow hedges. We had FX forward contracts with an aggregate notional amount of $6.3 and $26.0 outstanding as of December 31, 2020 and 2019, respectively, with all of the $6.3 scheduled to mature in 2021. Commodity Contracts From time to time, we enter into commodity contracts to manage the exposure on forecasted purchases of commodity raw materials. The outstanding notional amounts of commodity contracts were 3.2 and 3.4 pounds of copper at December 31, 2020 and 2019, respectively. We designate and account for these contracts as cash flow hedges and, to the extent these commodity contracts are effective in offsetting the variability of the forecasted purchases, the change in fair value is included in AOCI. We reclassify AOCI associated with our commodity contracts to cost of products sold when the forecasted transaction impacts earnings. As of December 31, 2020 and 2019, the fair values of these contracts were current assets of $2.4 and $0.4, respectively. The unrealized gains, net of taxes, recorded in AOCI were $1.5 and $0.3 as of December 31, 2020 and 2019, respectively. We anticipate reclassifying the unrealized gain as of December 31, 2020 to income over the next 12 months. Concentrations of Credit Risk Financial instruments that potentially subject us to significant concentrations of credit risk consist of cash and equivalents, trade accounts receivable, insurance recovery assets associated with asbestos product liability matters, and interest rate swap, foreign currency forward, and commodity contracts. These financial instruments, other than trade accounts receivable, are placed with high-quality financial institutions and insurance companies throughout the world. We periodically evaluate the credit standing of these financial institutions and insurance companies. We maintain cash levels in bank accounts that, at times, may exceed federally-insured limits. We have not experienced significant loss, and believe we are not exposed to significant risk of loss, in these accounts. We have credit loss exposure in the event of nonperformance by counterparties to the above financial instruments, but have no other off-balance-sheet credit risk of accounting loss. We anticipate, however, that counterparties will be able to fully satisfy their obligations under the contracts. We do not obtain collateral or other security to support financial instruments subject to credit risk, but we do monitor the credit standing of counterparties. Concentrations of credit risk arising from trade accounts receivable are due to selling to customers in a particular industry. Credit risks are mitigated by performing ongoing credit evaluations of our customers’ financial conditions and obtaining collateral, advance payments, or other security when appropriate. No one customer, or group of customers that to our knowledge are under common control, accounted for more than 10% of our revenues for any period presented.