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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated other comprehensive loss |  | $ 2,698.5 | $ 2,857.6 | $ 2,446.4 | $ 2,692.5
Reclassification of cumulative unrealized gain on Swiss franchise's investment portfolio | $ 15.3 |  |  |  |
Foreign currency translation |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated other comprehensive loss |  | (223.2) | (87.7) |  |
Translation loss on net investment hedge |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated other comprehensive loss |  | (4.7) | (39.9) |  |
Accumulated other comprehensive loss, income taxes |  | (12.9) | (23.1) |  |
Translation loss on long-term intercompany loans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated other comprehensive loss |  | (137.2) | (128.8) |  |
Unrealized gain on investments |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated other comprehensive loss |  | 0.0 | 15.3 |  |
Accumulated other comprehensive loss, income taxes |  | 0.0 | 3.4 |  |
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income taxes of $(23.2) and $(27.8), respectively |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated other comprehensive loss |  | (37.9) | (50.5) |  |
Accumulated other comprehensive loss, income taxes |  | (23.2) | (27.8) |  |
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $2.0 for both 2018 and 2017 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated other comprehensive loss |  | 3.2 | 3.4 |  |
Accumulated other comprehensive loss, income taxes |  | 2.0 | 2.0 |  |
Accumulated other comprehensive loss |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated other comprehensive loss |  | $ (399.8) | $ (288.2) | $ (426.1) | $ (286.0)

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