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Accumulated Other Comprehensive Loss - After-Tax Components of and Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | $ 2,601.1 | $ 2,363.0
Other comprehensive (loss) income, net of tax |  | (14.0) | 17.3
Ending Balance |  | 2,174.7 | 2,568.7
Foreign Currency Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | 5.8 | (28.0)
Amounts classified into accumulated other comprehensive income (loss) |  | (17.1) | 17.7
Other comprehensive (loss) income, net of tax |  | (17.1) | 17.7
Ending Balance |  | (11.3) | (10.3)
Derivative Hedging Gains (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (2.4) | (0.6)
Amounts classified into accumulated other comprehensive income (loss) |  | 2.9 | 3.3
Amounts reclassified from accumulated other comprehensive loss |  |  | (0.5)
Other comprehensive (loss) income, net of tax |  | 2.9 | 2.8
Ending Balance |  | 0.5 | 2.2
Defined benefit plan items [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | [1] | (42.6) | (43.3)
Amounts classified into accumulated other comprehensive income (loss) | [1] | 0.2 |
Amounts reclassified from accumulated other comprehensive loss | [1] |  | (3.2)
Other comprehensive (loss) income, net of tax | [1] | 0.2 | (3.2)
Ending Balance | [1] | (42.4) | (46.5)
Accumulated Other Comprehensive (Loss) Income [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (39.2) | (71.9)
Amounts classified into accumulated other comprehensive income (loss) |  | (14.0) | 21.0
Amounts reclassified from accumulated other comprehensive loss |  |  | (3.7)
Other comprehensive (loss) income, net of tax |  | (14.0) | 17.3
Ending Balance |  | $ (53.2) | $ (54.6)
[1] | See Note 12, "Defined Benefit Plans," for further information on the adjustments related to defined benefit plans.

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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