Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt (Narrative) (Details) € in Millions, £ in Millions, $ in Millions	Dec. 31, 2021 USD ($) loan	Dec. 31, 2021 GBP (£) loan	Dec. 31, 2021 EUR (€) loan	Jan. 01, 2021 USD ($)
Debt Instrument [Line Items]
Debt outstanding	$ 1,293.2			$ 1,291.4
Uncommitted Revolving Credit Facilities 55 million pounds GBP
Debt Instrument [Line Items]
Current borrowing capacity \| £		£ 55
Number of revolving loan facilities \| loan	1	1	1
Uncommitted Revolving Credit Facilities $75 million
Debt Instrument [Line Items]
Current borrowing capacity	$ 75.0
Number of revolving loan facilities \| loan	2	2	2
Uncommitted Revolving Credit Facilities 100 million euros
Debt Instrument [Line Items]
Current borrowing capacity \| €			€ 100.0
Number of revolving loan facilities \| loan	1	1	1
Two Thousand Eighteen Credit Facility \| JPMorgan Chase Bank \| Unsecured Debt \| Revolving Credit Facility, due May 2023
Debt Instrument [Line Items]
Current borrowing capacity	$ 1,250.0
Two Thousand Eighteen Credit Facility \| JPMorgan Chase Bank \| Unsecured Debt \| Additional Loan Facility
Debt Instrument [Line Items]
Current borrowing capacity	$ 500.0