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Capital Stock, Accumulated Other Comprehensive Loss and Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax
A summary of changes in accumulated other comprehensive loss, net of tax is shown below (in millions):
For the year ended December 31,
2017
 
2016
 
2015
Defined benefit plans:
 
 
 
 
 
Balance at beginning of year
$
(192.8
)
 
$
(194.6
)
 
$
(219.2
)
Reclassification adjustments (net of tax expense of $1.1 million in 2017, $12.1 million in 2016 and $1.4 million in 2015)
4.9

 
25.9

 
4.2

Other comprehensive income (loss) recognized during the period (net of tax benefit (expense) of ($0.4) million in 2017, $5.0 million in 2016 and ($6.9) million in 2015)
3.9

 
(24.1
)
 
20.4

Balance at end of year
$
(184.0
)
 
$
(192.8
)
 
$
(194.6
)
Derivative instruments and hedging activities:
 
 
 
 
 
Balance at beginning of year
$
(45.1
)
 
$
(38.7
)
 
$
(33.2
)
Reclassification adjustments (net of tax expense of $3.1 million in 2017, $28.8 million in 2016 and $14.9 million in 2015)
6.4

 
57.9

 
23.7

Other comprehensive income (loss) recognized during the period (net of tax benefit (expense) of ($12.8) million in 2017, $32.7 million in 2016 and $18.4 million in 2015)
15.8

 
(64.3
)
 
(29.2
)
Balance at end of year
$
(22.9
)
 
$
(45.1
)
 
$
(38.7
)
Cumulative translation adjustments:
 
 
 
 
 
Balance at beginning of year
$
(597.7
)
 
$
(496.8
)
 
$
(249.6
)
Other comprehensive income (loss) recognized during the period (net of tax benefit of $— million in 2017, $1.1 million in 2016 and $6.0 million in 2015)
291.2

 
(100.9
)
 
(247.2
)
Balance at end of year
$
(306.5
)
 
$
(597.7
)
 
$
(496.8
)