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Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2017
 
2016
 
Three Months Ended September 30,
 
US
 
Non-US
 
US
 
Non-US
 
2017
 
2016
Service cost
 
$
—

 
$
4.5

 
$
—

 
$
4.1

 
$
—

 
$
—

Interest cost
 
2.2

 
2.8

 
2.4

 
3.1

 
0.8

 
1.0

Expected return on plan assets
 
(3.3
)
 
(6.0
)
 
(3.7
)
 
(6.1
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.2
)
 
—

 
(0.2
)
 
—

 
(1.1
)
 
(1.2
)
Amortization of unrecognized loss
 
1.1

 
2.0

 
1.3

 
1.6

 
0.4

 
0.5

Net periodic benefit (income) cost
 
$
(0.2
)
 
$
3.3

 
$
(0.2
)
 
$
2.7

 
$
0.1

 
$
0.3


 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2017
 
2016
 
Nine Months Ended September 30,
 
US
 
Non-US
 
US
 
Non-US
 
2017
 
2016
Service cost
 
$
—

 
$
13.3

 
$
—

 
$
12.3

 
$
0.1

 
$
0.1

Interest cost
 
6.6

 
8.0

 
7.2

 
9.6

 
2.4

 
2.9

Expected return on plan assets
 
(9.8
)
 
(17.4
)
 
(11.2
)
 
(18.7
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.6
)
 
—

 
(0.6
)
 
—

 
(3.1
)
 
(3.6
)
Amortization of unrecognized loss
 
3.2

 
5.8

 
3.8

 
4.7

 
1.0

 
1.6

Net periodic benefit (income) cost
 
$
(0.6
)
 
$
9.7

 
$
(0.8
)
 
$
7.9

 
$
0.4

 
$
1.0