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Schedule II - Condensed Financial Information of Registrant Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from/(used in) operating activities: |  |  |  |
Share-based compensation |  | $ 9.8 | $ 15.5 | $ 17.9
Net cash (used in)/generated by operating activities |  | (111.5) | 453.2 | 574.2
Cash flows (used in)/from investing activities: |  |  |  |
Proceeds/(purchases) of short term investments |  | 96.0 | 190.6 | 45.6
Repayment of loan notes issued by Silverton |  | (115.6) | (89.3) | (67.8)
Payments for acquisitions and investments, net of cash acquired |  | (64.9) | (3.3) |
Other equity investments |  | (2.4) | (3.3) | (0.8)
Net cash from/(used in) investing activities |  | 419.0 | (350.9) | (501.9)
Cash flows (used in)/from financing activities: |  |  |  |
Proceeds from the issuance of ordinary shares, net of issuance costs |  | 0.5 | 2.5 | 6.8
Proceeds from the issuance of preference shares, net of issuance costs |  | 0.0 | 241.3 | 0.0
Preference share redemption |  | (293.2) | 0.0 | 0.0
Ordinary share repurchase |  | (30.0) | (75.0) | (83.7)
Proceeds from long term debt |  | 0.0 | 105.0 | 100.0
Cash paid for withholdings purposes | [1] | 9.6 | 0.0 | 0.0
Net cash (used in)/from financing activities |  | (540.4) | 90.0 | (133.5)
Increase/(decrease) in cash and cash equivalents |  | (219.0) | 174.3 | (79.0)
Cash and cash equivalents at beginning of period |  | 1,273.8 | 1,099.5 | 1,178.5
Cash and cash equivalents at end of period |  | 1,054.8 | 1,273.8 | 1,099.5
Parent |  |  |  |
Cash flows from/(used in) operating activities: |  |  |  |
Net income (1) (excluding equity in net earnings of subsidiaries) |  | 323.0 | 289.3 | 256.4
Share-based compensation |  | 9.8 | 15.5 | 17.9
Realized and unrealized losses/(gains) |  | (2.0) | (3.2) | (4.3)
Loss on derivative contracts |  | (2.6) | 0.5 | 1.2
Increase (Decrease) in Accounts and Other Receivables |  | 0.0 | 0.0 | 0.0
Change in other assets |  | (0.2) | 0.4 | (9.0)
Change in accrued expenses and other payables |  | 7.0 | (9.3) | (36.8)
Change in intercompany activities |  | (27.5) | (40.7) | 71.9
Net cash (used in)/generated by operating activities |  | 307.5 | 252.5 | 297.3
Cash flows (used in)/from investing activities: |  |  |  |
Proceeds/(purchases) of short term investments |  | (25.1) | 0.1 | 25.0
Payments to Acquire Marketable Securities |  | 66.3 | (145.7) | 0.0
Investment in subsidiaries |  | (111.9) | (126.1) | (171.5)
Investment in long-term debt issued by Silverton |  | 0.0 | (25.0) | (25.0)
Repayment of loan notes issued by Silverton |  | 13.5 | 19.2 | 20.5
Other equity investments |  | 0.0 | 0.0 | 0.0
Net cash from/(used in) investing activities |  | (7.1) | (281.0) | (201.8)
Cash flows (used in)/from financing activities: |  |  |  |
Proceeds from the issuance of ordinary shares, net of issuance costs |  | 0.5 | 2.5 | 6.8
Proceeds from the issuance of preference shares, net of issuance costs |  | 0.0 | 241.3 | 0.0
Preference share redemption |  | (293.2) | 0.0 | 0.0
Ordinary share repurchase |  | (30.0) | (75.0) | (83.7)
Ordinary and preference share dividends paid |  | (92.4) | (94.5) | (88.7)
Proceeds from maturity of Eurobond |  | 0.0 | 0.0 | 573.8
Eurobond purchased from subsidiary |  | 0.0 | 0.0 | (480.0)
Cash paid for withholdings purposes |  | 9.6 | 0.0 | 0.0
Net cash (used in)/from financing activities |  | (424.7) | 74.3 | (71.8)
Increase/(decrease) in cash and cash equivalents |  | (124.3) | 45.8 | 23.7
Cash and cash equivalents at beginning of period |  | 156.3 | 110.5 |
Cash and cash equivalents at end of period |  | 32.0 | 156.3 | 110.5
MVI | Parent |  |  |  |
Cash flows (used in)/from investing activities: |  |  |  |
Payments for acquisitions and investments, net of cash acquired |  | (0.1) | 0.0 | (0.8)
Bene | Parent |  |  |  |
Cash flows (used in)/from investing activities: |  |  |  |
Payments for acquisitions and investments, net of cash acquired |  | $ 0.0 | $ (3.3) | $ 0.0
[1] | The cash paid to the tax authority when withholding shares from employees' awards for tax-withholding purposes has been reclassified from operating activity to financing activity following the adoption of ASU 2016-09 -“Compensation — Stock Compensation”.

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