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Debt and Finance Lease Obligations (Senior Credit Facility) (Details) |  | 12 Months Ended | 18 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 16, 2019 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Jun. 30, 2020 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 04, 2020 USD ($) $ / shares
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Common shares, par value (in dollars per share) | $ / shares |  | $ 1.25 | $ 1.25 |  |  |  |  |
Repayments of debt |  | $ 191,258,000 | $ 105,000,000 | $ 60,000,000 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Amount outstanding |  | 0 | 0 |  |  |  |  |
Current borrowing capacity |  | 741,900,000 | 711,500,000 |  |  |  |  |
Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Letters of credit, amount outstanding |  | $ 58,100,000 | $ 88,500,000 |  |  |  |  |
Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 800,000,000.0 |  |  |  |  |  |  |
Maximum increase in borrowing capacity | 400,000,000.0 |  |  |  |  |  |  |
Commitment fee percentage |  | 0.20% |  |  |  |  |  |
Revolving Credit Facility | New Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Amount Of Cash And Cash Equivalents Excluded From Leverage Ratio |  |  |  |  |  |  |  | $ 250,000,000.0
Common shares, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 1.25
Letter of Credit | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | 750,000,000.0 |  |  |  |  |  |  |
Bridge Loan | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 30,000,000.0 |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.375% |  |  |  |  |  |  |
Base Rate | Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.375% |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Unused capacity, commitment fee percentage | 0.09% |  |  |  |  |  |  |
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |
Minimum | Base Rate | Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.00% |  |  |  |  |  |  |
Maximum | Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Unused capacity, commitment fee percentage | 0.30% |  |  |  |  |  |  |
Maximum | Revolving Credit Facility | New Credit Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Percentage Of Dividends And Share Repurchases |  |  |  |  | 115.00% |  |  |
Maximum | Revolving Credit Facility | New Credit Agreement | Forecast [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  |  |  | 4.00 | 4.00 |
Debt Instrument, Covenant, Leverage Ratio With Acquisitions |  |  |  |  |  | 4.50 |  |
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |  |  |
Maximum | Base Rate | Revolving Credit Facility | New Senior Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.75% |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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