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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common shares and paid-in surplus | Retained earnings | AOCI, after tax | Total | Non-controlling interest | Total Equity | Foreign Currency Gain (Loss) AOCI, after tax | Foreign Currency Gain (Loss) Total | Foreign Currency Gain (Loss) Non-controlling interest | Foreign Currency Gain (Loss) Total Equity | BAM Non-controlling interest | BAM Total Equity | MediaAlpha Non-controlling interest | MediaAlpha Total Equity
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balances at Dec. 31, 2017 |  | $ 670.6 | $ 2,823.2 | $ (1.3) | $ 3,492.5 | $ (131.7) | $ 3,360.8 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (50.9) |  | (3.7) |  | (3.7) | (47.2) | (50.9) |  |  |  |  |  |  |  |
Net change in foreign currency translation and other |  |  |  | (1.5) |  |  |  | $ (1.5) | $ (1.5) | $ 0.0 | $ (1.5) |  |  |  |
Total comprehensive income (loss) | (5.4) |  | (3.7) |  | (5.2) | (47.2) | (52.4) |  |  |  |  |  |  |  |
Dividends declared on common shares |  |  | (3.8) |  | (3.8) |  | (3.8) |  |  |  |  |  |  |  |
Dividends to non-controlling interests |  |  |  |  |  | (6.0) | (6.0) |  |  |  |  |  |  |  |
Repurchases and retirements of common shares |  | $ (104.6) | (408.4) |  | (513.0) |  | (513.0) |  |  |  |  |  |  |  |
Issuance of common shares (shares) |  | 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  |  |  |  | 2.0 |  | 2.0 |  |  |  |  |  |  |  |
Capital contributions from BAM members, net of tax |  |  |  |  |  |  |  |  |  |  |  | $ 22.9 | $ 22.9 |  |
Amortization of restricted share awards |  | $ 9.7 |  |  | 9.7 |  | 9.7 |  |  |  |  |  |  |  |
Recognition of equity-based units of subsidiary |  | 4.5 |  |  | 4.5 | 2.3 | 6.8 |  |  |  |  |  |  |  |
Dilution from equity-based units of subsidiary |  | (1.1) |  |  | (1.1) | 1.1 | 0.0 |  |  |  |  |  |  |  |
Acquisition of subsidiary |  | (1.6) |  |  | (1.6) |  | (1.6) |  |  |  |  |  |  |  |
Acquisition of non-controlling interests |  |  |  |  |  | 14.2 | 14.2 |  |  |  |  |  |  |  |
Ending Balances at Sep. 30, 2018 |  | 579.5 | 2,407.3 | (2.8) | 2,984.0 | (144.4) | 2,839.6 |  |  |  |  |  |  |  |
Beginning Balances at Jun. 30, 2018 |  | $ 575.8 | 2,366.5 | (2.2) | 2,940.1 | (142.6) | 2,797.5 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 30.6 |  | 40.8 |  | 40.8 | (10.2) | 30.6 |  |  |  |  |  |  |  |
Net change in foreign currency translation and other |  |  |  | (0.6) |  |  |  | (0.6) | (0.6) | 0.0 | (0.6) |  |  |  |
Total comprehensive income (loss) | 40.0 |  | 40.8 |  | $ 40.2 | (10.2) | 30.0 |  |  |  |  |  |  |  |
Dividends to non-controlling interests |  |  |  |  |  | $ (1.9) | $ (1.9) |  |  |  |  |  |  |  |
Issuance of common shares (shares) |  | 0.2 |  |  | 0.2 | 0.0 | 0.2 |  |  |  |  |  |  |  |
Capital contributions from BAM members, net of tax |  |  |  |  |  |  |  |  |  |  |  | 10.3 | 10.3 |  |
Amortization of restricted share awards |  | $ 3.3 |  |  | $ 3.3 |  | $ 3.3 |  |  |  |  |  |  |  |
Recognition of equity-based units of subsidiary |  | 0.2 |  |  | 0.2 | $ 0.0 | 0.2 |  |  |  |  |  |  |  |
Ending Balances at Sep. 30, 2018 |  | 579.5 | 2,407.3 | (2.8) | 2,984.0 | (144.4) | 2,839.6 |  |  |  |  |  |  |  |
Beginning Balances at Dec. 31, 2018 | 2,718.2 | 584.0 | 2,264.9 | (5.8) | 2,843.1 | (124.9) | 2,718.2 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 331.3 |  | 353.6 |  | 353.6 | (22.3) | 331.3 |  |  |  |  |  |  |  |
Net change in foreign currency translation and other |  |  |  |  |  |  |  | (5.5) | (5.5) | (0.3) | (5.8) |  |  |  |
Total comprehensive income (loss) | 347.8 |  | 353.6 | (5.5) | 348.1 | (22.6) | 325.5 |  |  |  |  |  |  |  |
Dividends declared on common shares |  |  | (3.2) |  | (3.2) |  | (3.2) |  |  |  |  |  |  |  |
Dividends to non-controlling interests |  |  |  |  |  | (1.6) | (1.6) |  |  |  |  |  |  |  |
Repurchases and retirements of common shares |  | (1.1) | (3.8) |  | (4.9) |  | (4.9) |  |  |  |  |  |  |  |
Issuance of common shares |  | 2.2 |  |  | 2.2 |  | 2.2 |  |  |  |  |  |  |  |
Capital contributions from BAM members, net of tax |  |  |  |  |  |  |  |  |  |  |  | 36.3 | 36.3 |  |
Net contributions from non-controlling interests |  |  |  |  |  | 2.3 | 2.3 |  |  |  |  |  |  |  |
Amortization of restricted share awards |  | 7.8 |  |  | 7.8 |  | 7.8 |  |  |  |  |  |  |  |
Recognition of equity-based units of subsidiary |  | 0.3 |  |  | 0.3 |  | 0.3 |  |  |  |  |  |  |  |
Effect of deconsolidation of MediaAlpha |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (13.8) | $ (13.8)
Acquisition of non-controlling interests |  |  |  |  |  | 1.8 | 1.8 |  |  |  |  |  |  |  |
Ending Balances at Sep. 30, 2019 | 3,070.9 | 593.2 | 2,611.5 | (11.3) | 3,193.4 | (122.5) | 3,070.9 |  |  |  |  |  |  |  |
Beginning Balances at Jun. 30, 2019 |  | 590.5 | 2,562.8 | (9.0) | 3,144.3 | (136.4) | 3,007.9 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 43.2 |  | 48.7 |  | 48.7 | (5.5) | 43.2 |  |  |  |  |  |  |  |
Net change in foreign currency translation and other |  |  |  |  |  |  |  | $ (2.3) | $ (2.3) | $ (0.1) | $ (2.4) |  |  |  |
Total comprehensive income (loss) | 46.3 |  | 48.7 | (2.3) | 46.4 | (5.6) | 40.8 |  |  |  |  |  |  |  |
Dividends to non-controlling interests |  |  |  |  |  | (0.6) | (0.6) |  |  |  |  |  |  |  |
Capital contributions from BAM members, net of tax |  |  |  |  |  |  |  |  |  |  |  | $ 19.3 | $ 19.3 |  |
Net contributions from non-controlling interests |  |  |  |  |  | 0.8 | 0.8 |  |  |  |  |  |  |  |
Amortization of restricted share awards |  | 2.7 |  |  | 2.7 |  | 2.7 |  |  |  |  |  |  |  |
Ending Balances at Sep. 30, 2019 | $ 3,070.9 | $ 593.2 | $ 2,611.5 | $ (11.3) | $ 3,193.4 | $ (122.5) | $ 3,070.9 |  |  |  |  |  |  |  |

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- Definition Dilution of Equity-Based Units of Subsidiary + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Effect of Deconsolidation + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Noncontrolling Interest, Increase from Contributions, Net + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Noncontrolling Interest, Recognition of Equity-Based Shares + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration