Condensed Consolidating Financial Information (Details 3) (USD $) In Millions	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Operating activities
Net cash provided by (used in) operating activities	$ 1,885.4	$ 1,929.5
Investing activities
Available-for-sale securities: Purchases	(5,179.4)	(5,226.5)
Available-for-sale securities: Sales	845.6	1,374.1
Available-for-sale securities: Maturities	4,350.3	3,608.4
Mortgage loans acquired or originated	(1,070.4)	(662.4)
Mortgage loans sold or repaid	1,269.6	1,238.7
Real estate acquired	(43.8)	(23.8)
Net (purchases) sales of property and equipment	(32.6)	(11.4)
Purchase of interests in subsidiaries, net of cash acquired	(206.9)
Net change in other investments	(21.5)	8.8
Net cash provided by (used in) investing activities	(89.1)	305.9
Financing activities
Issuance of common stock	23.2	20.0
Acquisition of treasury stock	(456.4)	(2.3)
Proceeds from financing element derivatives	74.7	78.6
Payments for financing element derivatives	(38.6)	(36.2)
Excess tax benefits from share-based payment arrangements	2.0	0.8
Dividends to preferred stockholders	(24.7)	(24.7)
Issuance of long-term debt	2.6	1.7
Principal repayments of long-term debt	(4.3)	(8.9)
Net proceeds from (repayments of) short-term borrowings	(30.7)	27.1
Investment contract deposits	4,067.3	3,015.7
Investment contract withdrawals	(5,836.3)	(5,311.6)
Net increase (decrease) in banking operation deposits	(15.2)	36.0
Other	(3.1)	(3.2)
Net cash provided by (used in) financing activities	(2,239.5)	(2,207.0)
Net increase (decrease) in cash and cash equivalents	(443.2)	28.4
Cash and cash equivalents at beginning of period	1,877.4	2,240.4
Cash and cash equivalents at end of period	1,434.2	2,268.8
Principal Financial Group, Inc. Parent Only
Operating activities
Net cash provided by (used in) operating activities	(249.2)	(177.4)
Investing activities
Available-for-sale securities: Purchases	(4.4)	(61.3)
Available-for-sale securities: Sales	200.0	95.5
Available-for-sale securities: Maturities	4.4	81.1
Dividends and returns of capital received from (contributions to) unconsolidated entities	506.3	301.6
Net change in other investments	(0.2)	13.3
Net cash provided by (used in) investing activities	706.1	430.2
Financing activities
Issuance of common stock	23.2	20.0
Acquisition of treasury stock	(456.4)	(2.3)
Dividends to preferred stockholders	(24.7)	(24.7)
Net cash provided by (used in) financing activities	(457.9)	(7.0)
Net increase (decrease) in cash and cash equivalents	(1.0)	245.8
Cash and cash equivalents at beginning of period	370.9	304.6
Cash and cash equivalents at end of period	369.9	550.4
Principal Life Insurance Company Only
Operating activities
Net cash provided by (used in) operating activities	1,983.6	1,769.8
Investing activities
Available-for-sale securities: Purchases	(4,697.5)	(4,319.0)
Available-for-sale securities: Sales	545.0	1,070.1
Available-for-sale securities: Maturities	3,825.7	3,079.4
Mortgage loans acquired or originated	(989.0)	(680.0)
Mortgage loans sold or repaid	1,106.6	1,132.9
Real estate acquired		(0.2)
Net (purchases) sales of property and equipment	(27.0)	(0.7)
Dividends and returns of capital received from (contributions to) unconsolidated entities	224.4	193.8
Net change in other investments	(51.4)	(19.9)
Net cash provided by (used in) investing activities	(63.2)	456.4
Financing activities
Proceeds from financing element derivatives	74.7	78.6
Payments for financing element derivatives	(38.6)	(36.2)
Excess tax benefits from share-based payment arrangements	0.8	0.3
Capital received from (dividends and capital paid to) parent	(506.4)	(301.6)
Investment contract deposits	3,746.8	2,916.0
Investment contract withdrawals	(5,834.3)	(5,311.6)
Other	(3.1)	(3.2)
Net cash provided by (used in) financing activities	(2,560.1)	(2,657.7)
Net increase (decrease) in cash and cash equivalents	(639.7)	(431.5)
Cash and cash equivalents at beginning of period	699.8	1,249.2
Cash and cash equivalents at end of period	60.1	817.7
Principal Financial Services, Inc. and Other Subsidiaries Combined
Operating activities
Net cash provided by (used in) operating activities	447.8	631.1
Investing activities
Available-for-sale securities: Purchases	(480.4)	(846.6)
Available-for-sale securities: Sales	110.1	248.9
Available-for-sale securities: Maturities	520.2	447.9
Mortgage loans acquired or originated	(114.2)	(206.1)
Mortgage loans sold or repaid	242.1	299.2
Real estate acquired	(43.8)	(23.6)
Net (purchases) sales of property and equipment	(5.6)	(10.7)
Purchase of interests in subsidiaries, net of cash acquired	(206.9)
Dividends and returns of capital received from (contributions to) unconsolidated entities	506.4	301.6
Net change in other investments	42.8	(116.2)
Net cash provided by (used in) investing activities	570.7	94.4
Financing activities
Excess tax benefits from share-based payment arrangements	1.2	0.5
Issuance of long-term debt	2.6	26.9
Principal repayments of long-term debt	(55.8)	(8.9)
Net proceeds from (repayments of) short-term borrowings	(30.7)	(5.0)
Capital received from (dividends and capital paid to) parent	(730.7)	(495.4)
Investment contract deposits	320.5	99.7
Investment contract withdrawals	(2.0)
Net increase (decrease) in banking operation deposits	(15.2)	36.0
Net cash provided by (used in) financing activities	(510.1)	(346.2)
Net increase (decrease) in cash and cash equivalents	508.4	379.3
Cash and cash equivalents at beginning of period	719.9	713.0
Cash and cash equivalents at end of period	1,228.3	1,092.3
Eliminations, Notes Guarantor
Operating activities
Net cash provided by (used in) operating activities	(296.8)	(294.0)
Investing activities
Available-for-sale securities: Purchases	2.9	0.4
Available-for-sale securities: Sales	(9.5)	(40.4)
Mortgage loans acquired or originated	32.8	223.7
Mortgage loans sold or repaid	(79.1)	(193.4)
Dividends and returns of capital received from (contributions to) unconsolidated entities	(1,237.1)	(797.0)
Net change in other investments	(12.7)	131.6
Net cash provided by (used in) investing activities	(1,302.7)	(675.1)
Financing activities
Issuance of long-term debt		(25.2)
Principal repayments of long-term debt	51.5
Net proceeds from (repayments of) short-term borrowings		32.1
Capital received from (dividends and capital paid to) parent	1,237.1	797.0
Net cash provided by (used in) financing activities	1,288.6	803.9
Net increase (decrease) in cash and cash equivalents	(310.9)	(165.2)
Cash and cash equivalents at beginning of period	86.8	(26.4)
Cash and cash equivalents at end of period	$ (224.1)	$ (191.6)

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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