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Retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic benefit cost recorded in the Condensed Consolidated Statements of Operations are as follows:
 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2015
 
2014
 
Three Months Ended June 30,
 
US
 
Non-US
 
US
 
Non-US
 
2015
 
2014
Service cost
 
$
—

 
$
3.7

 
$
—

 
$
3.2

 
$
—

 
$
0.1

Interest cost
 
2.7

 
3.5

 
3.1

 
4.7

 
1.4

 
1.7

Expected return on plan assets
 
(4.3
)
 
(6.2
)
 
(4.4
)
 
(5.4
)
 
—

 
—

Amortization of unrecognized prior service benefit
 
(0.2
)
 
—

 
(0.2
)
 
—

 
(1.4
)
 
(1.6
)
Amortization of unrecognized loss
 
1.7

 
1.7

 
1.7

 
1.3

 
0.8

 
0.6

Net periodic benefit (income) cost
 
$
(0.1
)
 
$
2.7

 
$
0.2

 
$
3.8

 
$
0.8

 
$
0.8


 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2015
 
2014
 
Six Months Ended June 30,
 
US
 
Non-US
 
US
 
Non-US
 
2015
 
2014
Service cost
 
$
—

 
$
7.4

 
$
—

 
$
6.5

 
$
0.1

 
$
0.1

Interest cost
 
5.5

 
7.1

 
6.2

 
9.3

 
2.8

 
3.4

Expected return on plan assets
 
(8.6
)
 
(12.4
)
 
(8.8
)
 
(10.8
)
 
—

 
—

Amortization of unrecognized prior service benefit
 
(0.4
)
 
—

 
(0.4
)
 
—

 
(2.8
)
 
(3.2
)
Amortization of unrecognized loss
 
3.3

 
3.4

 
3.3

 
2.5

 
1.5

 
1.3

Net periodic benefit (income) cost
 
$
(0.2
)
 
$
5.5

 
$
0.3

 
$
7.5

 
$
1.6

 
$
1.6