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Condensed Consolidating Financial Information - Guarantor, Statements of Cash Flows (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating activities    
Net cash provided by (used in) operating activities $ 3,713.9 $ 3,628.7
Investing activities    
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (10,992.3) (10,425.7)
Fixed maturities available-for-sale and equity securities with intent to hold: Sales 2,900.4 1,011.2
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 4,703.5 6,577.2
Mortgage loans acquired or originated (2,347.4) (2,036.5)
Mortgage loans sold or repaid 1,567.6 1,297.4
Real estate acquired (53.7) (113.6)
Real estate sold 63.5 457.1
Net (purchases) sales of property and equipment (73.4) (133.3)
Purchase of interests in subsidiaries, net of cash acquired (184.7)  
Net change in other investments 7.8 48.5
Net cash provided by (used in) investing activities (4,408.7) (3,317.7)
Financing activities    
Issuance of common stock 52.4 143.1
Acquisition of treasury stock (461.5) (218.1)
Proceeds from financing element derivatives   0.1
Payments for financing element derivatives (53.7) (59.5)
Purchase of subsidiary shares from noncontrolling interest (30.3) (13.3)
Dividends to common stockholders (446.5) (398.5)
Issuance of long-term debt 66.8  
Principal repayments of long-term debt (1.0) (56.2)
Net proceeds from (repayments of) short-term borrowings (0.8) 4.9
Investment contract deposits 6,228.5 8,244.4
Investment contract withdrawals (4,361.6) (7,963.1)
Net increase (decrease) in banking operation deposits 159.5 79.8
Other (1.1) 0.8
Net cash provided by (used in) financing activities 1,150.7 (235.6)
Net increase (decrease) in cash and cash equivalents 455.9 75.4
Cash and cash equivalents at beginning of period 2,470.8 2,719.6
Cash and cash equivalents at end of period 2,926.7 2,795.0
Principal Financial Group, Inc. Parent Only    
Operating activities    
Net cash provided by (used in) operating activities (164.6) (36.7)
Investing activities    
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (200.8)  
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 1.6  
Dividends and returns of capital received from (contributed to) unconsolidated entities 686.6 250.1
Net change in other investments 0.5 (4.4)
Net cash provided by (used in) investing activities 487.9 245.7
Financing activities    
Issuance of common stock 52.4 143.1
Acquisition of treasury stock (461.5) (218.1)
Dividends to common stockholders (446.5) (398.5)
Net cash provided by (used in) financing activities (855.6) (473.5)
Net increase (decrease) in cash and cash equivalents (532.3) (264.5)
Cash and cash equivalents at beginning of period 842.8 882.6
Cash and cash equivalents at end of period 310.5 618.1
Principal Life Insurance Company Only    
Operating activities    
Net cash provided by (used in) operating activities 3,686.0 4,946.3
Investing activities    
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (9,301.2) (9,431.3)
Fixed maturities available-for-sale and equity securities with intent to hold: Sales 1,978.3 731.7
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 4,288.0 5,964.6
Mortgage loans acquired or originated (2,126.7) (2,078.4)
Mortgage loans sold or repaid 1,379.6 1,244.6
Net (purchases) sales of property and equipment (42.3) (92.9)
Dividends and returns of capital received from (contributed to) unconsolidated entities 43.2 32.0
Net change in other investments 12.6 58.3
Net cash provided by (used in) investing activities (3,768.5) (3,571.4)
Financing activities    
Proceeds from financing element derivatives   0.1
Payments for financing element derivatives (53.7) (59.5)
Capital received from (dividends and capital paid to) parent (601.6) (1,243.5)
Investment contract deposits 5,923.4 7,976.5
Investment contract withdrawals (4,300.0) (7,943.1)
Other (1.1) 0.8
Net cash provided by (used in) financing activities 967.0 (1,268.7)
Net increase (decrease) in cash and cash equivalents 884.5 106.2
Cash and cash equivalents at beginning of period 426.7 675.1
Cash and cash equivalents at end of period 1,311.2 781.3
Principal Financial Services, Inc. and Other Subsidiaries Combined    
Operating activities    
Net cash provided by (used in) operating activities 688.9 (1,094.7)
Investing activities    
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (1,496.7) (994.4)
Fixed maturities available-for-sale and equity securities with intent to hold: Sales 922.1 292.4
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 413.9 612.6
Mortgage loans acquired or originated (326.4) (278.2)
Mortgage loans sold or repaid 223.3 200.5
Real estate acquired (53.7) (113.6)
Real estate sold 63.5 457.1
Net (purchases) sales of property and equipment (31.1) (40.4)
Purchase of interests in subsidiaries, net of cash acquired (184.7)  
Dividends and returns of capital received from (contributed to) unconsolidated entities 601.6 1,243.5
Net change in other investments (365.1) (354.2)
Net cash provided by (used in) investing activities (233.3) 1,025.3
Financing activities    
Purchase of subsidiary shares from noncontrolling interest (30.3) (14.6)
Sale of subsidiary shares to noncontrolling interest   1.3
Issuance of long-term debt 164.9 313.5
Principal repayments of long-term debt (36.3) (203.8)
Net proceeds from (repayments of) short-term borrowings (0.8) 4.9
Capital received from (dividends and capital paid to) parent (729.8) (282.1)
Investment contract deposits 305.1 267.9
Investment contract withdrawals (61.6) (20.0)
Net increase (decrease) in banking operation deposits 159.5 79.8
Net cash provided by (used in) financing activities (229.3) 146.9
Net increase (decrease) in cash and cash equivalents 226.3 77.5
Cash and cash equivalents at beginning of period 1,526.4 2,082.8
Cash and cash equivalents at end of period 1,752.7 2,160.3
Eliminations, Notes Guarantor    
Operating activities    
Net cash provided by (used in) operating activities (496.4) (186.2)
Investing activities    
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases 6.4  
Fixed maturities available-for-sale and equity securities with intent to hold: Sales   (12.9)
Mortgage loans acquired or originated 105.7 320.1
Mortgage loans sold or repaid (35.3) (147.7)
Dividends and returns of capital received from (contributed to) unconsolidated entities (1,331.4) (1,525.6)
Net change in other investments 359.8 348.8
Net cash provided by (used in) investing activities (894.8) (1,017.3)
Financing activities    
Purchase of subsidiary shares from noncontrolling interest   1.3
Sale of subsidiary shares to noncontrolling interest   (1.3)
Issuance of long-term debt (98.1) (313.5)
Principal repayments of long-term debt 35.3 147.6
Capital received from (dividends and capital paid to) parent 1,331.4 1,525.6
Net cash provided by (used in) financing activities 1,268.6 1,359.7
Net increase (decrease) in cash and cash equivalents (122.6) 156.2
Cash and cash equivalents at beginning of period (325.1) (920.9)
Cash and cash equivalents at end of period $ (447.7) $ (764.7)