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Nature of Operations and Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Recent Accounting Pronouncements
Stockholders' Equity	$ 15,462.3	$ 16,617.3	$ 12,972.6	$ 14,685.8
Retained earnings (accumulated deficit)
Recent Accounting Pronouncements
Stockholders' Equity	$ 12,199.2	$ 11,838.0	$ 11,198.8	11,074.3
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)

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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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