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Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2018
 
2017
 
Three Months Ended September 30,
 
US
 
Non-US
 
US
 
Non-US
 
2018
 
2017
Service cost
 
$
—

 
$
4.4

 
$
—

 
$
4.5

 
$
0.1

 
$
—

Interest cost
 
2.1

 
3.0

 
2.2

 
2.8

 
0.7

 
0.8

Expected return on plan assets
 
(3.4
)
 
(6.7
)
 
(3.3
)
 
(6.0
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.2
)
 
—

 
(0.2
)
 
—

 
(1.1
)
 
(1.1
)
Amortization of unrecognized loss
 
1.0

 
1.7

 
1.1

 
2.0

 
0.3

 
0.4

Net periodic benefit (income) cost
 
$
(0.5
)
 
$
2.4

 
$
(0.2
)
 
$
3.3

 
$
—

 
$
0.1

 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2018
 
2017
 
Nine Months Ended September 30,
 
US
 
Non-US
 
US
 
Non-US
 
2018
 
2017
Service cost
 
$
—

 
$
13.5

 
$
—

 
$
13.3

 
$
0.1

 
$
0.1

Interest cost
 
6.4

 
9.1

 
6.6

 
8.0

 
2.1

 
2.4

Expected return on plan assets
 
(10.3
)
 
(20.6
)
 
(9.8
)
 
(17.4
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.6
)
 
—

 
(0.6
)
 
—

 
(3.1
)
 
(3.1
)
Amortization of unrecognized loss
 
3.1

 
5.3

 
3.2

 
5.8

 
0.9

 
1.0

Net periodic benefit (income) cost
 
$
(1.4
)
 
$
7.3

 
$
(0.6
)
 
$
9.7

 
$
—

 
$
0.4