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Condensed Consolidating Financial Information - Shelf Registration Guarantor, Statements of Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities      
Net cash provided by (used in) operating activities $ 5,156.5 $ 4,188.0 $ 3,857.8
Investing activities      
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (13,909.8) (13,371.6) (13,763.8)
Fixed maturities available-for-sale and equity securities with intent to hold: Sales 3,813.1 1,413.6 1,890.5
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 6,217.6 8,743.2 7,742.8
Mortgage loans acquired or originated (3,447.5) (2,755.8) (2,889.0)
Mortgage loans sold or repaid 2,228.4 1,872.0 2,068.7
Real estate acquired (88.1) (200.5) (109.7)
Real estate sold 63.5 481.9 35.5
Net (purchases) sales of property and equipment (92.3) (164.8) (154.9)
Purchase of interests in subsidiaries, net of cash acquired (184.7)    
Net change in other investments (302.7) (70.8) 26.0
Net cash provided by (used in) investing activities (5,702.5) (4,052.8) (5,153.9)
Financing activities      
Issuance of common stock 64.0 162.5 37.8
Acquisition of treasury stock (671.6) (220.4) (277.3)
Proceeds from financing element derivatives   0.1 0.4
Payments for financing element derivatives (65.9) (77.6) (87.7)
Excess tax benefits from share-based payment arrangements     12.0
Dividends to common stockholders (598.6) (540.0) (464.9)
Purchase of subsidiary shares from noncontrolling interest (31.1) (13.3) (2.4)
Issuance of long-term debt 80.8 2.8 656.1
Principal repayments of long-term debt (1.3) (56.5) (799.3)
Net proceeds from (repayments of) short-term borrowings 8.5 (15.5) (131.4)
Investment contract deposits 8,308.8 10,154.4 10,770.9
Investment contract withdrawals (6,589.6) (9,914.6) (8,392.7)
Net increase (decrease) in banking operation deposits 553.0 136.6 129.0
Other (4.3) (2.5) 0.4
Net cash provided by (used in) financing activities 1,052.7 (384.0) 1,450.9
Net increase (decrease) in cash and cash equivalents 506.7 (248.8) 154.8
Cash and cash equivalents at beginning of period 2,470.8 2,719.6 2,564.8
Cash and cash equivalents at end of period 2,977.5 2,470.8 2,719.6
Principal Financial Group, Inc. Parent Only      
Operating activities      
Net cash provided by (used in) operating activities (132.4) (443.2) (188.6)
Investing activities      
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (210.9)    
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 2.3    
Net (purchases) sales of property and equipment (0.1) (0.1) (0.1)
Dividends and returns of capital received from (contributed to) unconsolidated entities 1,041.6 1,002.5 1,295.3
Net change in other investments (2.2) (1.1) 1.3
Net cash provided by (used in) investing activities 830.7 1,001.3 1,296.5
Financing activities      
Issuance of common stock 64.0 162.5 37.8
Acquisition of treasury stock (671.6) (220.4) (277.3)
Excess tax benefits from share-based payment arrangements     0.7
Dividends to common stockholders (598.6) (540.0) (464.9)
Issuance of long-term debt     644.2
Principal repayments of long-term debt     (744.5)
Net cash provided by (used in) financing activities (1,206.2) (597.9) (804.0)
Net increase (decrease) in cash and cash equivalents (507.9) (39.8) 303.9
Cash and cash equivalents at beginning of period 842.8 882.6 578.7
Cash and cash equivalents at end of period 334.9 842.8 882.6
Principal Financial Services, Inc. Only      
Operating activities      
Net cash provided by (used in) operating activities 696.3 (252.8) 255.7
Investing activities      
Dividends and returns of capital received from (contributed to) unconsolidated entities 589.1 691.2 1,583.3
Net change in other investments (166.2) 7.5 (56.8)
Net cash provided by (used in) investing activities 422.9 698.7 1,526.5
Financing activities      
Issuance of long-term debt 11.1 9.4 6.0
Principal repayments of long-term debt (57.1) (38.8) (20.0)
Capital received from (dividends and capital paid to) parent (1,041.6) (1,002.5) (1,295.3)
Net cash provided by (used in) financing activities (1,087.6) (1,031.9) (1,309.3)
Net increase (decrease) in cash and cash equivalents 31.6 (586.0) 472.9
Cash and cash equivalents at beginning of period 617.4 1,203.4 730.5
Cash and cash equivalents at end of period 649.0 617.4 1,203.4
Principal Life Insurance Company and Other Subsidiaries Combined      
Operating activities      
Net cash provided by (used in) operating activities 5,030.9 4,483.6 3,983.8
Investing activities      
Fixed maturities available-for-sale and equity securities with intent to hold: Purchases (13,698.9) (13,371.6) (13,763.8)
Fixed maturities available-for-sale and equity securities with intent to hold: Sales 3,813.1 1,413.6 1,890.5
Fixed maturities available-for-sale and equity securities with intent to hold: Maturities 6,215.3 8,743.2 7,742.8
Mortgage loans acquired or originated (3,447.5) (2,755.8) (2,889.0)
Mortgage loans sold or repaid 2,228.4 1,872.0 2,068.7
Real estate acquired (88.1) (200.5) (109.7)
Real estate sold 63.5 481.9 35.5
Net (purchases) sales of property and equipment (92.2) (164.7) (154.8)
Purchase of interests in subsidiaries, net of cash acquired (184.7)    
Net change in other investments (413.9) (61.6) 258.2
Net cash provided by (used in) investing activities (5,605.0) (4,043.5) (4,921.6)
Financing activities      
Proceeds from financing element derivatives   0.1 0.4
Payments for financing element derivatives (65.9) (77.6) (87.7)
Excess tax benefits from share-based payment arrangements     11.3
Purchase of subsidiary shares from noncontrolling interest (31.1) (13.3) (2.4)
Issuance of long-term debt 80.8 2.8 11.9
Principal repayments of long-term debt (1.3) (56.5) (54.8)
Net proceeds from (repayments of) short-term borrowings 8.5 (92.0) (163.7)
Capital received from (dividends and capital paid to) parent (589.1) (691.2) (1,583.3)
Investment contract deposits 8,308.8 10,154.4 10,770.9
Investment contract withdrawals (6,589.6) (9,914.6) (8,392.7)
Net increase (decrease) in banking operation deposits 553.0 136.6 129.0
Other (4.3) (2.5) 0.4
Net cash provided by (used in) financing activities 1,669.8 (553.8) 639.3
Net increase (decrease) in cash and cash equivalents 1,095.7 (113.7) (298.5)
Cash and cash equivalents at beginning of period 2,001.1 2,114.8 2,413.3
Cash and cash equivalents at end of period 3,096.8 2,001.1 2,114.8
Eliminations, Shelf Registration Debt Guarantor      
Operating activities      
Net cash provided by (used in) operating activities (438.3) 400.4 (193.1)
Investing activities      
Dividends and returns of capital received from (contributed to) unconsolidated entities (1,630.7) (1,693.7) (2,878.6)
Net change in other investments 279.6 (15.6) (176.7)
Net cash provided by (used in) investing activities (1,351.1) (1,709.3) (3,055.3)
Financing activities      
Issuance of long-term debt (11.1) (9.4) (6.0)
Principal repayments of long-term debt 57.1 38.8 20.0
Net proceeds from (repayments of) short-term borrowings   76.5 32.3
Capital received from (dividends and capital paid to) parent 1,630.7 1,693.7 2,878.6
Net cash provided by (used in) financing activities 1,676.7 1,799.6 2,924.9
Net increase (decrease) in cash and cash equivalents (112.7) 490.7 (323.5)
Cash and cash equivalents at beginning of period (990.5) (1,481.2) (1,157.7)
Cash and cash equivalents at end of period $ (1,103.2) $ (990.5) $ (1,481.2)