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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Restricted cash balances, beginning of period $ 22.2 $ 56.1 $ 188.5 $ 249.8
Restricted cash balances, end of period $ 22.2 $ 56.1 $ 188.5 $ 249.8