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Accumulated Other Comprehensive Loss
 9 Months Ended
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss
 
The changes in accumulated other comprehensive loss by component for the three months and nine months ended September 30, were as follows:
(in millions)
 
Accrued post-retirement benefit liability (1)
 
Foreign currency translation
 
Other, net
 
Total
Balance at June 30, 2017
 
$
(25.6
)
 
$
(65.5
)
 
$
0.2

 
$
(90.9
)
Other comprehensive income (loss) before reclassifications
 
—

 
13.4

 
(0.2
)
 
13.2

Amounts reclassified from accumulated other comprehensive loss
 
0.6

 
—

 
—

 
0.6

Income tax expense
 
(0.2
)
 
—

 
—

 
(0.2
)
Other comprehensive income (loss)
 
0.4

 
13.4

 
(0.2
)
 
13.6

Balance at September 30, 2017
 
$
(25.2
)
 
$
(52.1
)
 
$
—

 
$
(77.3
)
 
 
 
 
 
 
 
 
 
Balance at June 30, 2016
 
$
(26.6
)
 
$
(64.8
)
 
$
—

 
$
(91.4
)
Other comprehensive loss before reclassifications
 
—

 
(0.5
)
 
(0.1
)
 
(0.6
)
Amounts reclassified from accumulated other comprehensive loss
 
0.6

 
—

 
—

 
0.6

Net income tax expense
 
(0.3
)
 
—

 
—

 
(0.3
)
Other comprehensive income (loss)
 
0.3

 
(0.5
)
 
(0.1
)
 
(0.3
)
Balance at September 30, 2016
 
$
(26.3
)
 
$
(65.3
)
 
$
(0.1
)
 
$
(91.7
)
 
 
 
 
 
 
 
 
 
Balance at January 1, 2017
 
$
(26.4
)
 
$
(96.7
)
 
$
0.9

 
$
(122.2
)
Other comprehensive income (loss) before reclassifications
 
—

 
44.6

 
(0.4
)
 
44.2

Amounts reclassified from accumulated other comprehensive loss
 
1.9

 
—

 
(0.5
)
 
1.4

Income tax expense
 
(0.7
)
 
—

 
—

 
(0.7
)
Other comprehensive income (loss)
 
1.2

 
44.6

 
(0.9
)
 
44.9

Balance at September 30, 2017
 
$
(25.2
)
 
$
(52.1
)
 
$
—

 
$
(77.3
)
 
 
 
 
 
 
 
 
 
Balance at January 1, 2016
 
$
(27.4
)
 
$
(60.0
)
 
$
0.3

 
$
(87.1
)
Other comprehensive loss before reclassifications
 
—

 
(5.3
)
 
(0.3
)
 
(5.6
)
Amounts reclassified from accumulated other comprehensive loss
 
1.8

 
—

 
(0.2
)
 
1.6

Income tax (expense) benefit
 
(0.7
)
 
—

 
0.1

 
(0.6
)
Other comprehensive income (loss)
 
1.1

 
(5.3
)
 
(0.4
)
 
(4.6
)
Balance at September 30, 2016
 
$
(26.3
)
 
$
(65.3
)
 
$
(0.1
)
 
$
(91.7
)
 
 
 
 
 
 
 
 
 
(1) Current period amounts for the accrued post-retirement benefit liability are related to the amortization of unrecognized actuarial gains and losses, which is included in net periodic benefit cost for pension and other post-retirement welfare plans. See Note 13 for further information.