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Investment in TRIP Holdings (Tables)
 12 Months Ended
Dec. 31, 2012
Investment In TRIP Holdings [Abstract]  
Company's carrying value of its investment in TRIP Holdings
The Company’s carrying value of its investment in TRIP Holdings is as follows:
 
December 31,
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
10.1

 
12.0

Equity in unrealized losses on derivative financial instruments
0.8

 
(1.3
)
Distributions
(7.0
)
 
(7.0
)
Deferred broker fees
(0.4
)
 
(0.6
)
 
$
95.6

 
$
95.2