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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of expense for amortization of capitalized computer software costs.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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The cash outflow associated with the development or modification of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

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Goodwill and Other Assets Schedule of Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,055.7		$ 1,085.9
Accumulated amortization	(659.6)		(637.3)
Net carrying amount	396.1		448.6
Payments to Develop Software	11.2	$ 8.9
Amortization of internally-developed software	$ (12.5)	(14.5)
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years 8 months 12 days
Gross carrying amount	$ 737.9		762.0
Accumulated amortization	(382.1)		(354.1)
Net carrying amount	$ 355.8		407.9
Internally-developed software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years 6 months
Gross carrying amount	$ 205.1		198.0
Accumulated amortization	(166.9)		(160.0)
Net carrying amount	38.2	40.3	38.0	$ 46.0
Transfer To Held For Sale	$ 1.5	$ (0.1)
Development costs non-software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 6 months
Gross carrying amount	$ 54.3		56.1
Accumulated amortization	(54.2)		(55.8)
Net carrying amount	$ 0.1		0.3
Other intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 1 month 6 days
Gross carrying amount	$ 58.4		69.8
Accumulated amortization	(56.4)		(67.4)
Net carrying amount	2.0		2.4
Other intangible asset, net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	317.8		323.9
Accumulated amortization	(277.5)		(283.2)
Net carrying amount	$ 40.3		$ 40.7