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

 
$
4.5

 
$
—

 
$
4.5

 
$
—

 
$
0.1

Interest cost
 
2.2

 
3.0

 
2.2

 
2.6

 
0.7

 
0.8

Expected return on plan assets
 
(3.5
)
 
(6.9
)
 
(3.2
)
 
(5.8
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.2
)
 
—

 
(0.2
)
 
—

 
(1.0
)
 
(1.0
)
Amortization of unrecognized loss
 
1.1

 
1.8

 
1.0

 
1.9

 
0.3

 
0.3

Net periodic benefit (income) cost
 
$
(0.4
)
 
$
2.4

 
$
(0.2
)
 
$
3.2

 
$
—

 
$
0.2

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

 
$
9.1

 
$
—

 
$
8.8

 
$
—

 
$
0.1

Interest cost
 
4.3

 
6.1

 
4.4

 
5.2

 
1.4

 
1.6

Expected return on plan assets
 
(6.9
)
 
(13.9
)
 
(6.5
)
 
(11.4
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.4
)
 
—

 
(0.4
)
 
—

 
(2.0
)
 
(2.0
)
Amortization of unrecognized loss
 
2.1

 
3.6

 
2.1

 
3.8

 
0.6

 
0.6

Net periodic benefit (income) cost
 
$
(0.9
)
 
$
4.9

 
$
(0.4
)
 
$
6.4

 
$
—

 
$
0.3