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Investment in Persol Holdings - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Jan. 01, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Gain (loss) on investment in Persol Holdings | $ 15.8 | $ 0.0 | $ (13.0) | $ 0.0 |
Unrealized gains on investment, net of tax | $ 0.0 | 28.8 | $ 0.0 | 48.6 |
Persol Holdings Investment |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Unrealized gains on investment, net of tax |  | $ 28.8 |  | $ 48.6 |
OCI & AOCI |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ 140.0
Cumulative effect adjustment, taxes |  |  |  |  | $ 69.9

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