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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of changes in Accumulated other comprehensive income (loss) by component 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.