Segments - Operating Earnings Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total operating earnings before income taxes	$ 184.1	$ 235.1	$ 415.2	$ 404.9
Income (loss) attributable to noncontrolling interest	52.0	(25.5)	53.1	(24.8)
Income (loss) before income taxes	231.1	153.1	71.7	394.4
Operating Segments \| Retirement
Segment Reporting Information [Line Items]
Total operating earnings before income taxes	32.9	140.5	181.0	244.2
Operating Segments \| Investment Management
Segment Reporting Information [Line Items]
Total operating earnings before income taxes	84.9	31.8	134.2	54.5
Operating Segments \| Annuities
Segment Reporting Information [Line Items]
Total operating earnings before income taxes	65.8	72.6	129.3	123.3
Operating Segments \| Individual Life
Segment Reporting Information [Line Items]
Total operating earnings before income taxes	62.3	50.3	94.0	91.4
Operating Segments \| Employee Benefits
Segment Reporting Information [Line Items]
Total operating earnings before income taxes	27.0	32.3	37.6	53.1
Corporate
Segment Reporting Information [Line Items]
Total operating earnings before income taxes	(88.8)	(92.4)	(160.9)	(161.6)
Adjustments
Segment Reporting Information [Line Items]
Net investment gains (losses) and related charges and adjustments	3.4	(24.7)	(22.9)	(85.1)
Net guaranteed benefit hedging gains (losses) and related charges and adjustments	24.9	21.2	66.4	114.7
Loss related to businesses exited through reinsurance or divestment	0.8	0.5	(4.5)	2.1
Income (loss) attributable to noncontrolling interest	52.0	(25.5)	53.1	(24.8)
Loss related to early extinguishment of debt	0.0	(102.4)	(0.7)	(104.1)
Other adjustments to operating earnings	(6.1)	(7.6)	(19.8)	(15.8)
Adjustments \| Closed Block Variable Annuity
Segment Reporting Information [Line Items]
Closed Block Variable Annuity	$ (28.0)	$ 56.5	$ (415.1)	$ 102.5

The revenues less expenses from operations of the closed block during the period, before income taxes allocated thereto.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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