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Shareholders Equity (Tables)
 6 Months Ended
Jun. 30, 2019
Shareholders' Equity [Abstract]  
Schedule Of Activity In Our Various Shareholders Equity [Table Text Block]
Activity in our various shareholders' equity accounts for the six-month periods ended June 30, 2019 and 2018 were as follows (in millions):
 
 Shares 
 
Par Value
 
Additional
Paid-in
Capital
 
Retained
Earnings
 
AOCI 
 
Treasury
Shares
 
Non-controlling
Interest
BALANCE, December 31, 2018
115.2

 
$
46.2

 
$
7,225.0

 
$
874.2

 
$
18.2

 
$
(72.2
)
 
$
(2.6
)
Net loss
—

 
—

 
—

 
(190.4
)
 
—

 
—

 
2.4

Dividends paid ($0.04 per share)
—

 
—

 
—

 
(4.5
)
 
—

 
—

 
—

Shares issued under share-based compensation plans, net
—

 
—

 
(.1
)
 
—

 
—

 
.1

 
—

Repurchase of shares
—

 
—

 
—

 
—

 
—

 
(2.8
)
 
—

Share-based compensation cost
—

 
—

 
5.3

 
—

 
—

 
—

 
—

Net other comprehensive income
—

 
—

 
—

 
—

 
1.5

 
—

 
—

BALANCE, March 31, 2019
115.2

 
$
46.2

 
$
7,230.2

 
$
679.3

 
$
19.7

 
$
(74.9
)
 
$
(0.2
)
Net income
—

 
—

 
—

 
405.5

 
—

 
—

 
1.8

Equity issuance in connection with the Rowan Transaction
88.0

 
35.2

 
1,365.5

 
—

 
—

 
2.1

 
—

Shares issued under share-based compensation plans, net
2.6

 
1.1

 
(1.1
)
 
—

 
—

 
(.8
)
 
—

Repurchase of shares
—

 
—

 
—

 
—

 
—

 
(1.4
)
 
—

Share-based compensation cost
—

 
—

 
13.8

 
—

 
—

 
—

 
—

Net other comprehensive income
—

 
—

 
—

 
—

 
.2

 
—

 
—

BALANCE, June 30, 2019
205.8

 
$
82.5

 
$
8,608.4

 
$
1,084.8

 
$
19.9

 
$
(75.0
)
 
$
1.6


 
 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
—

 
—

 
—

 
(140.1
)
 
—

 
—

 
(.4
)
Dividends paid ($0.04 per share)
—

 
—

 
—

 
(4.4
)
 
—

 
—

 
—

Cumulative-effect due to ASU 2018-02
—

 
—

 
—

 
(.8
)
 
.8

 
—

 
—

Shares issued under share-based compensation plans, net
—

 
—

 
(.1
)
 
—

 
—

 
.1

 
—

Repurchase of shares
—

 
—

 
—

 
—

 
—

 
(1.1
)
 
—

Share-based compensation cost
—

 
—

 
7.5

 
—

 
—

 
—

 
—

Net other comprehensive loss
—

 
—

 
—

 
—

 
(.4
)
 
—

 
—

BALANCE, March 31, 2018
111.8

 
$
44.8

 
$
7,202.4

 
$
1,387.4

 
$
29.0

 
$
(70.0
)
 
$
(2.5
)
Net loss
—

 
—

 
—

 
(151.0
)
 
—

 
—

 
.9

Dividends paid ($0.04 per share)
—

 
—

 
—

 
(4.4
)
 
—

 
—

 
—

Shares issued under share-based compensation plans, net
3.4

 
1.4

 
(.4
)
 
—

 
—

 
(1.4
)
 
—

Distributions to noncontrolling interests
—

 
—

 
—

 
—

 
—

 
—

 
(.7
)
Repurchase of shares
—

 
—

 
—

 
—

 
—

 
(.6
)
 
—

Share-based compensation cost
—

 
—

 
7.5

 
—

 
—

 
—

 
—

Net other comprehensive loss
—

 
—

 
—

 
—

 
(8.5
)
 
—

 
—

BALANCE, June 30, 2018
115.2

 
$
46.2

 
$
7,209.5

 
$
1,232.0

 
$
20.5

 
$
(72.0
)
 
$
(2.3
)