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Accumulated Other Comprehensive (Loss) Income (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Changes in each component of accumulated other comprehensive (loss) income, net of tax, during 2017, 2016 and 2015 were as follows:
  ($ amounts in millions)
 
Foreign Currency Translation Adjustments
 
Pension and Post-retirement Plans
 
Unrealized Gain (Loss) on Available for Sale Securities
 
Derivative Financial Instrument Revaluation
 
Non-Controlling Interests
 
Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2014
 
$
(122.2
)
 
$
(14.9
)
 
$
0.1

 
$
—

 
$
6.4

 
$
(130.6
)
Other comprehensive (loss) income before reclassifications, net
 
(777.1
)
 
(10.9
)
 
1.1

 
(8.1
)
 
40.0

 
(755.0
)
Reclassifications, pretax
 
—

 
—

 
—

 
—

 
—

 
—

Tax benefit reclassified
 
—

 
(0.5
)
 
—

 
—

 
—

 
(0.5
)
Balance at December 31, 2015
 
(899.3
)
 
(26.3
)
 
1.2

 
(8.1
)
 
46.4

 
(886.1
)
Other comprehensive income (loss) before reclassifications, net
 
204.6

 
8.3

 
(0.8
)
 
(9.6
)
 
(2.0
)
 
200.5

Reclassifications, pretax
 
—

 
(0.8
)
 
—

 
11.9

 
—

 
11.1

Tax (benefit) expense reclassified
 
—

 
—

 
—

 
—

 
—

 
—

Balance at December 31, 2016
 
(694.7
)
 
(18.8
)
 
0.4

 
(5.8
)
 
44.4

 
(674.5
)
Other comprehensive income (loss) before reclassifications, net
 
241.1

 
2.5

 
(2.2
)
 
(4.6
)
 
(3.6
)
 
233.2

Reclassifications, pretax
 
—

 
10.5

 
0.5

 
10.4

 
—

 
21.4

Tax (benefit) expense reclassified
 
—

 
(2.1
)
 
—

 
—

 
—

 
(2.1
)
Balance at December 31, 2017
 
$
(453.6
)
 
$
(7.9
)
 
$
(1.3
)
 
$
—

 
$
40.8

 
$
(422.0
)