Amount of lease cost recognized by lessee for lease contract.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Leases, Operating lease cost and lease terms (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating lease cost	$ 97.6
Rent expense under operating leases		$ 87.2	$ 58.5
Minimum
Lease, renewal term	1 year
Maximum
Lease, renewal term	6 years
Real Estate Leases [Member] \| Minimum
Lease term	2 years
Real Estate Leases [Member] \| Maximum
Lease term	12 years