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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity Note [Abstract]

Schedule Of Activity In Our Various Shareholders' Equity

Activity in our various shareholders' equity accounts for each of the years in the three-year period ended December 31, 2020 was as follows (in millions, except per share amounts):


			Shares						Par Value						Additional Paid-in Capital						Retained Earnings						AOCI						Treasury Shares						Non-controlling Interest
BALANCE, December 31, 2017			111.8						$	44.8					$	7,195.0					$	1,532.7					$	28.6					$	(69.0)					$	(2.1)
Net loss			—						—						—						(639.7)						—						—						3.1
Dividends paid ($0.16 per share)			—						—						—						(18.0)						—						—						—
Cumulative-effect reduction from adoption of ASU 2018-02			—						—						—						(.8)						.8						—						—
Distributions to noncontrolling interests			—						—						—						—						—						—						(3.6)
Shares issued under share-based compensation plans, net			3.4						1.4						(.6)						—						—						(1.3)						—
Repurchase of shares			—						—						—						—						—						(1.9)						—
Share-based compensation cost			—						—						30.6						—						—						—						—
Net other comprehensive loss			—						—						—						—						(11.2)						—						—
BALANCE, December 31, 2018			115.2						46.2						7,225.0						874.2						18.2						(72.2)						(2.6)
Net loss			—						—						—						(198.0)						—						—						5.8
Dividends paid ($0.04 per share)			—						—						—						(4.5)						—						—						—
Equity issuance in connection with the Rowan Transaction			88.0						35.2						1,367.5						—						—						.1						—
Shares issued under share-based compensation plans, net			2.7						1.1						(1.3)						—						—						(.7)						—
Distributions to noncontrolling interests			—						—						—						—						—						—						(4.5)
Repurchase of shares			—						—						—						—						—						(4.5)						—
Equity issuance cost			—						—						(.6)						—						—						—						—
Share-based compensation cost			—						—						37.2						—						—						—						—
Net changes in pension and other postretirement benefits			—						—						—						—						(21.7)						—						—
Net other comprehensive income			—						—						—						—						9.7						—						—
BALANCE, December 31, 2019			205.9						82.5						8,627.8						671.7						6.2						(77.3)						(1.3)
Net loss			—						—						—						(4,855.5)						—						—						(2.1)
Shares issued under share-based compensation plans, net			.2						.1						(1.9)						—						—						2.0						—
Repurchase of shares			—						—						—						—						—						(.9)						—
Share-based compensation cost			—						—						21.2						—						—						—						—
Net changes in pension and other postretirement benefits			—						—						—						—						(76.5)						—						—
Purchase of noncontrolling interests			—						—						(7.2)						—						—						—						—
Distributions to noncontrolling interests			—						—						—						—						—						—						(.9)
Net other comprehensive loss			—						—						—						—						(17.6)						—						—
BALANCE, December 31, 2020			206.1						$	82.6					$	8,639.9					$	(4,183.8)					$	(87.9)					$	(76.2)					$	(4.3)