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Other income/ (expense) items (Tables)
 12 Months Ended
Dec. 31, 2017
Analysis of income and expense [abstract]  
Schedule of other income/ (expense) items
(a)   Profit on sale of redundant site
 
Credited to operating profit:
 
 
 
 
 
 
 
 
Profit on sale of redundant site
 
0.4

 
2.1

 
—

 
 
 
 
0.4

 
2.1

 
—

 
(b)   Changes to defined benefit pension plans
 
Credited to operating profit:
 
 
 
 
 
 
 
 
Changes to defined benefit pension plans
 
—

 
0.6

 
18.0

 
 
 
 
—

 
0.6

 
18.0

 
(c)   Restructuring and other expense
 
Charged to operating profit:
 
 
 
 
 
 
 
 
Rationalization of operations
 
(12.1
)
 
(0.4
)
 
(21.8
)
 
 
Patent infringement litigation costs
 
(3.5
)
 
(0.6
)
 
(0.5
)
 
 
Direct listing costs
 
(2.3
)
 
—

 
—

 
 
Non-current asset impairments
 
(3.7
)
 
—

 
—

 
 
Receivable impairment provision
 
—

 
(1.2
)
 
—

 
 
I.P.O. related share based compensation charges
 
—

 
—

 
(0.1
)
 
 
 
 
(21.6
)
 
(2.2
)
 
(22.4
)
 
(d)   Net gain / (loss) on acquisitions and disposals
 
(Charged)/credited to non-operating profit:
 
 
 
 
 
 
 
 
Merger and acquisition costs
 
(0.9
)
 
(0.3
)
 
(2.0
)
 
 
Gain on bargain purchase
 
1.2

 
—

 
—

 
 
Remeasurement of deferred contingent consideration
 
1.0

 
0.5

 
—

 
 
 
 
1.3

 
0.2

 
(2.0
)