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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Opening balance $ (126.2)
Other comprehensive income before reclassifications 3.7
Amounts reclassified from AOCL 0.8
Total other comprehensive income 4.5
Closing balance (121.7)
Derivative Instruments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Opening balance 0.3
Other comprehensive income before reclassifications 0.2
Amounts reclassified from AOCL 0.0
Total other comprehensive income 0.2
Closing balance 0.5
Defined Benefit Pension Plan Items [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Opening balance (46.0)
Other comprehensive income before reclassifications 0.0
Amounts reclassified from AOCL 0.8
Total other comprehensive income 0.8
Closing balance (45.2)
Foreign Currency Translation Items [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Opening balance (80.5)
Other comprehensive income before reclassifications 3.5
Amounts reclassified from AOCL 0.0
Total other comprehensive income 3.5
Closing balance $ (77.0)