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Shareholders Equity Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 6,295.6		$ 9,309.6
Net loss	(3,007.7)	$ (188.0)
Other Comprehensive Income (Loss), Net of Tax	$ (13.4)	$ 1.5
Common Stock [Member]
Shares, Issued	205.9	115.2	205.9	115.2
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 82.5	$ 46.2	$ 82.5	$ 46.2
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 8,634.9	$ 7,230.2	8,627.8	7,225.0
Shares Issued Under Share Based Compensation Plans, Shares	(0.7)	(0.1)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 7.8	$ 5.3
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(2,334.6)	679.3	671.7	874.2
Net loss	(3,006.3)	(190.4)
Dividends, Common Stock, Cash		(4.5)
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7.2)	19.7	6.2	18.2
Other Comprehensive Income (Loss), Net of Tax	(13.4)	1.5
Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (77.3)	$ (74.9)	(77.3)	(72.2)
Shares Issued Under Share Based Compensation Plans, Shares	0.9	0.1
Stock Repurchased During Period, Value	$ (0.9)	$ (2.8)
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(2.7)	(0.2)	$ (1.3)	$ (2.6)
Net loss	$ (1.4)	$ 2.4

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