Other Assets - Schedule of Other Investments (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Securities Carrying Value	$ 52.2
Unrealized Amortized Cost On Securities	38.1
Investments, Unrealized Gains	14.1
Investments, Unrealized Losses	0.0
Fixed Maturities Available For Sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,531.8	$ 1,721.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	46.2	13.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	42.9	96.4
Available-for-sale Securities, Debt Securities	1,535.1	1,638.1
Available For Sale Securities Carrying Value	1,535.1	1,638.1
Fixed Maturities Available For Sale [Member] \| Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	14.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0.0
Available For Sale Securities Carrying Value		14.1
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Securities Fair Value	52.2
Estimate of Fair Value Measurement [Member] \| Fixed Maturities Available For Sale [Member] \| Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities	14.1
Equity Securities Classified As Held For Trading [Member] \| Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Securities Carrying Value		32.8
Available-for-sale Equity Securities, Amortized Cost Basis		$ 18.7
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	14.1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0.0
Equity Securities Classified As Held For Trading [Member] \| Estimate of Fair Value Measurement [Member] \| Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Equity Securities	32.8
Other invested assets \| Other Investments Asset [Member] \| All Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Other invested assets	5.3
Other Investments Gross Unrealized Gain	0.0
Other Short Term Investments Gross Unrealized Losses	0.0
Trading Securities	5.3
Other invested assets \| Estimate of Fair Value Measurement [Member] \| Other Investments Asset [Member] \| All Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Trading Securities	$ 5.3

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