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Leases, Other supplemental data related to operating leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases	$ 88.1	$ 86.0
Right-of-use assets obtained in exchange for lease liabilities	$ 104.7	$ 98.6
Weighted Average Remaining Lease Term	5 years	6 years
Weighted Average Discount Rate	2.60%	3.20%

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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