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Condensed Consolidating Financial Information - Guarantor, Statements of Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities      
Net cash provided by (used in) operating activities $ 4,188.0 $ 3,857.8 $ 4,377.1
Investing activities      
Available-for-sale securities: Purchases (13,371.6) (13,763.8) (9,920.3)
Available-for-sale securities: Sales 1,413.6 1,890.5 1,563.0
Available-for-sale securities: Maturities 8,743.2 7,742.8 6,625.9
Mortgage loans acquired or originated (2,755.8) (2,889.0) (2,275.1)
Mortgage loans sold or repaid 1,872.0 2,068.7 1,687.3
Real estate acquired (200.5) (109.7) (322.0)
Real estate sold 481.9 35.5 208.9
Net (purchases) sales of property and equipment (164.8) (154.9) (136.4)
Purchase of interests in subsidiaries, net of cash acquired     (291.2)
Net change in other investments (70.8) 26.0 (307.7)
Net cash provided by (used in) investing activities (4,052.8) (5,153.9) (3,167.6)
Financing activities      
Issuance of common stock 162.5 37.8 76.1
Acquisition of treasury stock (220.4) (277.3) (300.6)
Proceeds from financing element derivatives 0.1 0.4 0.3
Payments for financing element derivatives (77.6) (87.7) (82.0)
Excess tax benefits from share-based payment arrangements   12.0 15.7
Purchase of subsidiary shares from noncontrolling interest (13.3) (2.4) (22.5)
Dividends to common stockholders (540.0) (464.9) (441.0)
Dividends to preferred stockholders     (16.5)
Preferred stock redemption     (550.0)
Issuance of long-term debt 2.8 656.1 804.9
Principal repayments of long-term debt (56.5) (799.3) (52.6)
Net proceeds from (repayments of) short-term borrowings (15.5) (131.4) 157.0
Investment contract deposits 10,154.4 10,770.9 6,492.3
Investment contract withdrawals (9,914.6) (8,392.7) (6,666.8)
Net increase (decrease) in banking operation deposits 136.6 129.0 91.1
Other (2.5) 0.4 (14.0)
Net cash provided by (used in) financing activities (384.0) 1,450.9 (508.6)
Net increase (decrease) in cash and cash equivalents (248.8) 154.8 700.9
Cash and cash equivalents at beginning of period 2,719.6 2,564.8 1,863.9
Cash and cash equivalents at end of period 2,470.8 2,719.6 2,564.8
Principal Financial Group, Inc. Parent Only      
Operating activities      
Net cash provided by (used in) operating activities (443.2) (188.6) (85.1)
Investing activities      
Net (purchases) sales of property and equipment (0.1) (0.1)  
Dividends and returns of capital received from (contributed to) unconsolidated entities 1,002.5 1,295.3 685.5
Net change in other investments (1.1) 1.3 5.4
Net cash provided by (used in) investing activities 1,001.3 1,296.5 690.9
Financing activities      
Issuance of common stock 162.5 37.8 76.1
Acquisition of treasury stock (220.4) (277.3) (300.6)
Excess tax benefits from share-based payment arrangements   0.7 0.7
Dividends to common stockholders (540.0) (464.9) (441.0)
Dividends to preferred stockholders     (16.5)
Preferred stock redemption     (550.0)
Issuance of long-term debt   644.2 791.8
Principal repayments of long-term debt   (744.5)  
Net cash provided by (used in) financing activities (597.9) (804.0) (439.5)
Net increase (decrease) in cash and cash equivalents (39.8) 303.9 166.3
Cash and cash equivalents at beginning of period 882.6 578.7 412.4
Cash and cash equivalents at end of period 842.8 882.6 578.7
Principal Life Insurance Company Only      
Operating activities      
Net cash provided by (used in) operating activities 5,571.5 3,657.5 3,803.0
Investing activities      
Available-for-sale securities: Purchases (12,054.5) (12,771.1) (8,835.2)
Available-for-sale securities: Sales 1,005.3 1,312.7 1,017.2
Available-for-sale securities: Maturities 7,894.7 7,097.4 5,847.9
Mortgage loans acquired or originated (2,629.8) (2,615.7) (2,177.1)
Mortgage loans sold or repaid 1,696.2 1,843.6 1,441.8
Real estate acquired     (0.3)
Real estate sold   3.5  
Net (purchases) sales of property and equipment (108.1) (113.2) (109.3)
Dividends and returns of capital received from (contributed to) unconsolidated entities 149.7 3.1 (1.5)
Net change in other investments 281.9 314.2 555.0
Net cash provided by (used in) investing activities (3,764.6) (4,925.5) (2,261.5)
Financing activities      
Proceeds from financing element derivatives 0.1 0.4 0.3
Payments for financing element derivatives (77.6) (87.7) (82.0)
Excess tax benefits from share-based payment arrangements   4.7 5.7
Capital received from (dividends and capital paid to) parent (1,845.9) (1,195.0) (485.6)
Investment contract deposits 9,760.5 10,465.8 6,214.8
Investment contract withdrawals (9,889.9) (8,373.3) (6,655.5)
Other (2.5) 0.3 (14.0)
Net cash provided by (used in) financing activities (2,055.3) 815.2 (1,016.3)
Net increase (decrease) in cash and cash equivalents (248.4) (452.8) 525.2
Cash and cash equivalents at beginning of period 675.1 1,127.9 602.7
Cash and cash equivalents at end of period 426.7 675.1 1,127.9
Principal Financial Services, Inc. and Other Subsidiaries Combined      
Operating activities      
Net cash provided by (used in) operating activities (2,114.7) 1,601.1 317.0
Investing activities      
Available-for-sale securities: Purchases (1,317.1) (1,005.8) (1,085.1)
Available-for-sale securities: Sales 425.1 577.8 546.4
Available-for-sale securities: Maturities 848.5 645.4 778.0
Mortgage loans acquired or originated (448.1) (333.5) (325.8)
Mortgage loans sold or repaid 388.4 274.7 307.6
Real estate acquired (200.5) (109.7) (321.7)
Real estate sold 481.9 32.0 208.9
Net (purchases) sales of property and equipment (56.6) (41.6) (27.1)
Purchase of interests in subsidiaries, net of cash acquired     (291.2)
Dividends and returns of capital received from (contributed to) unconsolidated entities 1,845.9 1,195.0 485.6
Net change in other investments 155.4 (954.8) (528.7)
Net cash provided by (used in) investing activities 2,122.9 279.5 (253.1)
Financing activities      
Excess tax benefits from share-based payment arrangements   6.6 9.3
Purchase of subsidiary shares from noncontrolling interest (16.2) (4.3) (23.4)
Sale of subsidiary shares to noncontrolling interest 2.9 1.9 0.9
Issuance of long-term debt 380.5 6.8 235.5
Principal repayments of long-term debt (269.9) (47.5) (116.4)
Net proceeds from (repayments of) short-term borrowings (15.5) (131.4) 157.0
Capital received from (dividends and capital paid to) parent (1,152.2) (1,298.4) (684.0)
Investment contract deposits 393.9 305.1 277.5
Investment contract withdrawals (24.7) (19.4) (11.3)
Net increase (decrease) in banking operation deposits 136.6 129.0 91.1
Other   0.1  
Net cash provided by (used in) financing activities (564.6) (1,051.5) (63.8)
Net increase (decrease) in cash and cash equivalents (556.4) 829.1 0.1
Cash and cash equivalents at beginning of period 2,082.8 1,253.7 1,253.6
Cash and cash equivalents at end of period 1,526.4 2,082.8 1,253.7
Eliminations, Notes Guarantor      
Operating activities      
Net cash provided by (used in) operating activities 1,174.4 (1,212.2) 342.2
Investing activities      
Available-for-sale securities: Purchases   13.1  
Available-for-sale securities: Sales (16.8)   (0.6)
Mortgage loans acquired or originated 322.1 60.2 227.8
Mortgage loans sold or repaid (212.6) (49.6) (62.1)
Dividends and returns of capital received from (contributed to) unconsolidated entities (2,998.1) (2,493.4) (1,169.6)
Net change in other investments (507.0) 665.3 (339.4)
Net cash provided by (used in) investing activities (3,412.4) (1,804.4) (1,343.9)
Financing activities      
Purchase of subsidiary shares from noncontrolling interest 2.9 1.9 0.9
Sale of subsidiary shares to noncontrolling interest (2.9) (1.9) (0.9)
Issuance of long-term debt (377.7) 5.1 (222.4)
Principal repayments of long-term debt 213.4 (7.3) 63.8
Capital received from (dividends and capital paid to) parent 2,998.1 2,493.4 1,169.6
Net cash provided by (used in) financing activities 2,833.8 2,491.2 1,011.0
Net increase (decrease) in cash and cash equivalents 595.8 (525.4) 9.3
Cash and cash equivalents at beginning of period (920.9) (395.5) (404.8)
Cash and cash equivalents at end of period $ (325.1) $ (920.9) $ (395.5)