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Investment in Persol Holdings - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017 | Jan. 01, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Loss on investment in Persol Holdings | $ (52.5) | $ 0.0 | $ (28.8) | $ 0.0 |
Unrealized gains on investment, net of tax | $ 0.0 | 0.9 | $ 0.0 | 19.8 |
Persol Holdings Investment |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Unrealized gains on investment, net of tax |  | $ 0.9 |  | $ 19.8 |
OCI & AOCI |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ 140.0
Cumulative effect adjustment, taxes |  |  |  |  | $ 69.9

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