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Shareholders Equity Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total debtors' equity	$ 3,461.2				$ 4,370.3
Net loss	(907.6)		$ (3,007.7)
Other Comprehensive Income (Loss), Net of Tax	(5.3)		$ (13.4)
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued		206.1		205.9	206.1	205.9
Total debtors' equity		$ 82.6		$ 82.5	$ 82.6	$ 82.5
Additional Paid-in Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total debtors' equity		8,643.5		8,634.9	8,639.9	8,627.8
Shares Issued Under Share Based Compensation Plans, Amount		(0.2)		(0.7)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition		3.8		7.8
Retained Earnings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total debtors' equity		(5,093.8)		(2,334.6)	(4,183.8)	671.7
Net loss		(910.0)		(3,006.3)
AOCI Attributable to Parent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total debtors' equity		(93.2)		(7.2)	(87.9)	6.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	$ 0.1
Other Comprehensive Income (Loss), Net of Tax		(5.4)		(13.4)
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total debtors' equity		(76.0)		(77.3)	(76.2)	(77.3)
Shares Issued Under Share Based Compensation Plans, Amount		0.2		0.9
Stock Repurchased During Period, Value				(0.9)
Noncontrolling Interest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total debtors' equity		(1.9)		(2.7)	$ (4.3)	$ (1.3)
Net loss		$ 2.4		$ (1.4)

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-Section 65
-Paragraph 8
-Subparagraph (d)(3)

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- Definition

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