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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 was as follows (in millions):
 
 Shares 
 
Par Value
 
Additional
Paid-in
Capital
 
Retained
Earnings
 
AOCI 
 
Treasury
Shares
 
Non-controlling
Interest
BALANCE, December 31, 2015
242.9

 
$
24.4

 
$
5,554.5

 
$
985.3

 
$
12.5

 
$
(63.8
)
 
$
4.3

Net income
—

 
—

 
—

 
890.2

 
—

 
—

 
6.9

Dividends paid ($0.04 per share)
—

 
—

 
—

 
(11.4
)
 
—

 
—

 
—

Distributions to noncontrolling interests
—

 
—

 
—

 
—

 
—

 
—

 
(7.8
)
Equity issuance
65.6

 
6.5

 
579.0

 
—

 
—

 
—

 
—

Equity for debt exchange
1.8

 
.2

 
14.8

 
—

 
—

 
—

 
—

Equity component of convertible debt
—

 
—

 
220.0

 
—

 
—

 
—

 
—

Contributions from noncontrolling interests
—

 
—

 
—

 
—

 
—

 
—

 
1.0

Tax expense on share-based compensation
—

 
—

 
(3.4
)
 
—

 
—

 
—

 
—

Repurchase of shares
—

 
—

 
—

 
—

 
—

 
(2.0
)
 
—

Share-based compensation cost
—

 
—

 
37.3

 
—

 
—

 
—

 
—

Net other comprehensive loss
—

 
—

 
—

 
—

 
6.5

 
—

 
—

BALANCE, December 31, 2016
310.3

 
31.1

 
6,402.2

 
1,864.1

 
19.0

 
(65.8
)
 
4.4

Net loss
—

 
—

 
—

 
(303.7
)
 
—

 
—

 
(.5
)
Dividends paid ($0.04 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
132.2

 
13.2

 
757.5

 
—

 
—

 
—

 
—

Shares issued under share-based compensation plans, net
4.5

 
.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
447.0

 
44.8

 
7,195.0

 
1,532.7

 
28.6

 
(69.0
)
 
(2.1
)
Net loss
—

 
—

 
—

 
(639.7
)
 
—

 
—

 
3.1

Dividends paid ($0.04 per share)
—

 
—

 
—

 
(18.0
)
 
—

 
—

 
—

Cumulative-effect reduction from adoption of ASU 2018-02
—

 
—

 
—

 
(.8
)
 
.8

 
—

 
—

Shares issued under share-based compensation plans, net
13.7

 
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
460.7

 
$
46.2

 
$
7,225.0

 
$
874.2

 
$
18.2

 
$
(72.2
)
 
$
(2.6
)