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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in accumulated other comprehensive loss
Changes in accumulated other comprehensive loss for the twelve months ended December 31, 2012, 2011, and 2010 are as follows:
 
Currency translation adjustments
 
Unrealized loss on derivative financial instruments
 
Net actuarial gains/(losses) of defined benefit plans
 
Other
 
Accumulated
Other
Comprehensive
Loss
 
(in millions)
Balances at December 31, 2009
$
(17.1
)
 
$
(29.0
)
 
$
(50.8
)
 
$
(1.1
)
 
$
(98.0
)
Other comprehensive income (loss)
—

 
(7.3
)
 
8.7

 
1.1

 
2.5

Balances at December 31, 2010
(17.1
)
 
(36.3
)
 
(42.1
)
 
—

 
(95.5
)
Other comprehensive income (loss)
—

 
0.1

 
(28.6
)
 
—

 
(28.5
)
Reclassification of purchase of additional interest in TRIP Holdings
—

 
(15.5
)
 
—

 
—

 
(15.5
)
Tax expense allocation related to TRIP Holdings unrealized loss on derivative financial instruments
—

 
5.5

 
—

 
—

 
5.5

Balances at December 31, 2011
(17.1
)
 
(46.2
)
 
(70.7
)
 
—

 
(134.0
)
Other comprehensive income (loss)
0.6

 
11.4

 
(28.1
)
 
—

 
(16.1
)
Balances at December 31, 2012
$
(16.5
)
 
$
(34.8
)
 
$
(98.8
)
 
$
—

 
$
(150.1
)