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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2017
 
2016
 
Three Months Ended March 31,
 
US
 
Non-US
 
US
 
Non-US
 
2017
 
2016
Service cost
 
$
—

 
$
4.3

 
$
—

 
$
4.0

 
$
—

 
$
0.1

Interest cost
 
2.2

 
2.6

 
2.4

 
3.2

 
0.8

 
1.0

Expected return on plan assets
 
(3.3
)
 
(5.6
)
 
(3.7
)
 
(6.3
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.2
)
 
—

 
(0.2
)
 
—

 
(1.0
)
 
(1.2
)
Amortization of unrecognized loss
 
1.1

 
1.9

 
1.2

 
1.6

 
0.3

 
0.5

Net periodic benefit (income) cost
 
$
(0.2
)
 
$
3.2

 
$
(0.3
)
 
$
2.5

 
$
0.1

 
$
0.4