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Derivatives and Hedging Activities (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 04, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Accumulated derivative losses |  | $ 98,100,000 | $ 140,900,000
Interest Rate Swap [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Remaining maturity year |  | 2023 |
Interest Rate Swap [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Remaining maturity year |  | 2025 |
2018 Term Loan [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount |  | $ 1,950,000,000 |
Derivative fixed interest rate |  | 1.874% |
Derivative asset, fair value |  | $ 43,700,000 | $ 12,100,000
Cash Flow Hedges [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Cash transfer in connection with termination of swaps | $ 0 |  |
Cash Flow Hedges [Member] | 2018 Term Loan [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount |  | $ 1,950,000,000 |
Payment to terminate | $ 176,200,000 |  |
London Interbank Offered Rate (LIBOR) [Member] | 2018 Term Loan [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative basis spread on variable interest rate |  | 1.75% |

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
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