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Acquisitions Cash Paid for Acquisitions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Paid for Acquisitions [Abstract]
Cost of investment: current-year acquisitions 1	$ 8.5	$ 0.6	$ 2,323.4
Cost of investment: prior-year acquisitions	45.9	15.8	33.9
Less: net cash acquired	(2.9)	0.0	(13.8)
Total cost of investment	51.5	16.4	2,343.5
Operating payments	2.9	9.3	19.4
Total cash paid for acquisitions	54.4	25.7	2,362.9
Acquisitions, net of cash acquired	4.9	0.6	2,309.8
Payments for previous acquisition, financing cash flows	$ 46.6	$ 15.8	$ 33.7

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- Definition

Cash Paid for Acquisitions [Abstract]

+ References

No definition available.

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- Definition

The cash outflow associated with the current year acquisition of business during the period. The cash portion only of the acquisition price.

+ References

No definition available.

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- Definition

The cash outflow associated with the prior year acquisition of businesses during the period. The cash portion only of the acquisition price.

+ References

No definition available.

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- Definition

Total Cash Payments to Acquire Businesses including Operating Expenses

+ References

No definition available.

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- Definition

The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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- Definition

Cash outflow representing an adjustment to the purchase price of a previous acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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