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Other Liabilities - Other Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Feb. 14, 2013
Sep. 30, 2012
Components of Other Liabilities [Abstract]      
Amounts payable for investment purchases $ 208.2   $ 206.7
Retained asset account 207.5   203.7
Amounts payable to reinsurers 46.9   32.0
Remittances and items not allocated 44.1   29.5
Oil and natural gas asset-retirement obligations 25.4 18.5 0
Other liabilities 185.9   128.7
Total other liabilities $ 718.0   $ 600.6