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Debt (Details Textual)		3 Months Ended	9 Months Ended	18 Months Ended
	Jul. 16, 2019	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2020 USD ($) $ / shares	Jun. 30, 2020	Mar. 31, 2022	Dec. 31, 2021	Sep. 14, 2020 USD ($)	Sep. 04, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares
Line of Credit Facility [Line Items]
Common shares, par value (in dollars per share) | $ / shares		$ 1.25	$ 1.25						$ 1.25
2030 USD Senior notes
Line of Credit Facility [Line Items]
Debt Instrument, face amount							$ 500,000,000.0
Stated interest rate (as a percent)		3.50%	3.50%				3.50%
Price of notes as a percentage of principal amount							99.656%
2022 EUR Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate (as a percent)		1.25%	1.25%						1.25%
Repayment of debt		$ 191,400,000
Loss on debt extinguishment		1,200,000
Senior Credit Facility
Line of Credit Facility [Line Items]
Letters of credit outstanding		54,100,000	$ 54,100,000						$ 88,500,000
Line of credit facility, current borrowing capacity		745,900,000	745,900,000						711,500,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility		$ 0	$ 0						$ 0
Revolving Credit Facility | New Credit Agreement
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity								$ 800,000,000.0
Cash and cash equivalents excluded from leverage raito								$ 250,000,000.0
Common shares, par value (in dollars per share) | $ / shares								$ 1.25
Revolving Credit Facility | New Senior Credit Facility
Line of Credit Facility [Line Items]
Maximum increase in borrowing capacity								$ 400,000,000.0
Line of credit, commitment fee (as a percentage)			0.20%
Letter of Credit | New Senior Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity								750,000,000.0
Swing Line Loans | New Senior Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity								$ 30,000,000.0
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]
Commitment fee percentage for unused capacity	0.09%
Minimum | 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 Credit Agreement
Line of Credit Facility [Line Items]
Percentage of dividends and share purchases				115.00%
Maximum | Revolving Credit Facility | New Credit Agreement | Forecast
Line of Credit Facility [Line Items]
Leverage ratio					4.00	4.00
Leverage ratio with acquisitions					4.50
Maximum | Revolving Credit Facility | New Senior Credit Facility
Line of Credit Facility [Line Items]
Commitment fee percentage for unused capacity	0.30%
Maximum | 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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Debt Instrument, Covenant, Leverage Ratio

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Debt Instrument, Covenant, Maximum Amount Of Cash And Cash Equivalents Excluded From Leverage Ratio

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Debt Instrument, Covenant, Percentage Of Dividends And Share Repurchases

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Line Of Credit Facility, Maximum Increase In Borrowing Capacity

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The price of senior notes stated as a percentage of the principal amount.

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Face amount or stated value per share of common stock.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount of cash inflow (outflow) from long-term debt, including capital lease obligations and mandatory redeemable capital securities.

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