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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Beginning balance | $ 1,615.5
Other comprehensive income (loss) before income taxes and reclassifications | 34.1
Income tax expense | (2.7)
Reclassifications to earnings | 2.6
Other comprehensive income | 34.0
Ending balance | 1,686.8
ASU 2018-02 [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Cumulative-effect adjustment related to the adoption of ASU 2018-02 (Please refer to Note 2) | (27.1)
Foreign Currency Translation Adjustment [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Beginning balance | (207.5)
Other comprehensive income (loss) before income taxes and reclassifications | 12.3
Other comprehensive income | 12.3
Ending balance | (195.2)
Unrealized Gain (Loss) from Invested Customer Trust Funds [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Beginning balance | (18.3)
Other comprehensive income (loss) before income taxes and reclassifications | 21.9
Income tax expense | (2.7)
Other comprehensive income | 19.2
Ending balance | 1.3
Unrealized Gain (Loss) from Invested Customer Trust Funds [Member] | ASU 2018-02 [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Cumulative-effect adjustment related to the adoption of ASU 2018-02 (Please refer to Note 2) | 0.4
Pension Liability Adjustment [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Beginning balance | (150.1)
Other comprehensive income (loss) before income taxes and reclassifications | (0.1)
Reclassifications to earnings | 2.6
Other comprehensive income | 2.5
Ending balance | (175.1)
Pension Liability Adjustment [Member] | ASU 2018-02 [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Cumulative-effect adjustment related to the adoption of ASU 2018-02 (Please refer to Note 2) | (27.5)
Accumulated Other Comprehensive Income (Loss) [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Beginning balance | (375.9)
Ending balance | (369.0)
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2018-02 [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Cumulative-effect adjustment related to the adoption of ASU 2018-02 (Please refer to Note 2) | $ (27.1)

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