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Nature of Operations and Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Recent Accounting Pronouncements
Stockholders' Equity	$ 15,721.1	$ 15,311.0	$ 14,685.8	$ 14,872.8	$ 14,102.0	$ 11,456.0
Retained earnings (accumulated deficit)
Recent Accounting Pronouncements
Stockholders' Equity	$ 11,521.4	$ 11,441.4	11,074.3	$ 10,927.8	$ 10,805.8	10,290.2
ASU 2016-13 - CECL | Effects of implementation of accounting change
Recent Accounting Pronouncements
Stockholders' Equity			(8.4)
ASU 2016-13 - CECL | Retained earnings (accumulated deficit) | Effects of implementation of accounting change
Recent Accounting Pronouncements
Stockholders' Equity			$ (8.4)
ASU 2016-02 - Leases | Effects of implementation of accounting change
Recent Accounting Pronouncements
Stockholders' Equity						4.0
ASU 2016-02 - Leases | Retained earnings (accumulated deficit) | Effects of implementation of accounting change
Recent Accounting Pronouncements
Stockholders' Equity						$ 4.0

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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