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Investment in TRIP Holdings (Tables)
 9 Months Ended
Sep. 30, 2012
Investment In TRIP Holdings [Abstract]  
Companies carrying value of its investment in TRIP
The Company’s carrying value of its investment in TRIP Holdings is as follows:
 
 
September 30,
2012
 
December 31,
2011
 
 
(in millions)
Capital contributions
 
$
47.3

 
$
47.3

Equity purchased from investors
 
44.8

 
44.8

 
 
92.1

 
92.1

Equity in earnings
 
10.7

 
12.0

Equity in unrealized losses on derivative financial instruments
 
—

 
(1.3
)
Distributions
 
(7.0
)
 
(7.0
)
Deferred broker fees
 
(0.4
)
 
(0.6
)
 
 
$
95.4

 
$
95.2