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Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2019
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, 2019 was as follows (in millions):
 
 Shares 
 
Par Value
 
Additional
Paid-in
Capital
 
Retained
Earnings
 
AOCI 
 
Treasury
Shares
 
Non-controlling
Interest
BALANCE, December 31, 2016
77.6

 
$
31.1

 
$
6,402.2

 
$
1,864.1

 
$
19.0

 
$
(65.8
)
 
$
4.4

Net loss

 

 

 
(303.7
)
 

 

 
(.5
)
Dividends paid ($0.16 per share)

 

 

 
(13.6
)
 

 

 

Cumulative-effect reduction from adoption of ASU 2016-16
 
 
 
 
 
 
(14.1
)
 
 
 
 
 
 
Distributions to noncontrolling interests

 

 

 

 

 

 
(6.0
)
Equity issuance in connection with Atwood Merger
33.1

 
13.2

 
757.5

 

 

 

 

Shares issued under share-based compensation plans, net
1.1

 
.5

 
(.4
)
 

 

 
(1.3
)
 

Repurchase of shares

 

 

 

 

 
(1.9
)
 

Share-based compensation cost

 

 
35.7

 

 

 

 

Net other comprehensive income

 

 

 

 
9.6

 

 

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

 

 

Shares issued under share-based compensation plans, net
3.4

 
1.4

 
(.6
)
 

 

 
(1.3
)
 

Distributions to noncontrolling interests

 

 

 

 

 

 
(3.6
)
Repurchase of shares

 

 

 

 

 
(1.9
)
 

Share-based compensation cost

 

 
30.6

 

 

 

 

Net other comprehensive income

 

 

 

 
(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
)
 

Repurchase of shares

 

 

 

 

 
(4.5
)
 

Share-based compensation cost

 

 
37.2

 

 

 

 

Equity issuance cost

 

 
(.6
)
 

 

 

 

Net changes in pension and other postretirement benefits

 

 

 

 
(21.7
)
 

 

Distributions to noncontrolling interests

 

 

 

 

 

 
(4.5
)
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
)