Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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+ Details

Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to stockholders' equity attributable to parent	$ 1,048.8	$ 1,170.3	$ 1,297.1	$ 1,055.6	$ 889.7	$ 960.3
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to stockholders' equity attributable to parent	$ (2,163.5)	$ (2,004.6)	(1,813.4)	$ (1,932.5)	$ (2,067.3)	(2,018.6)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to stockholders' equity attributable to parent			19.2			0.5
Cumulative Effect, Period of Adoption, Adjustment \| Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to stockholders' equity attributable to parent			$ 19.2			$ 0.5