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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investments | $ 1,187.1 | $ 1,174.8
Class A |  |
Common stock, nominal value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, issued (in shares) | 204,748,939 | 204,450,499
Common stock, outstanding (in shares) | 204,748,939 | 204,450,499
Class B |  |
Common stock, nominal value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, issued (in shares) | 11,489,888 | 11,099,593
Common stock, outstanding (in shares) | 11,489,888 | 11,099,593
Class C |  |
Common stock, nominal value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, issued (in shares) | 522,757,246 | 531,174,389
Common stock, outstanding (in shares) | 522,757,246 | 531,174,389

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