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Interim Financial Data by Segment - Revenue and Earnings Before Taxes by Segment (Details) (USD $)
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3 Months Ended |
9 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2015
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Mar. 31, 2014
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| Segment Reporting Information [Line Items] |
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|
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| Amortization of intangibles |
$ 7,000,000 |
$ 7,100,000 |
$ 37,500,000 |
$ 21,500,000 |
| Revenues |
526,400,000 |
501,100,000 |
1,560,400,000 |
1,470,900,000 |
| Earnings before Income Taxes |
91,000,000 |
100,500,000 |
232,600,000 |
268,100,000 |
| Separation costs |
600,000 |
0 |
34,600,000 |
0 |
| Segment Reconciling Items |
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| Segment Reporting Information [Line Items] |
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| Revenues |
(14,700,000) |
(1,500,000) |
(23,500,000) |
(5,400,000) |
| Earnings before Income Taxes |
(2,400,000) |
(200,000) |
(4,100,000) |
300,000 |
| Automotive Retail North America | Operating Segments |
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| Segment Reporting Information [Line Items] |
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| Revenues |
347,300,000 |
321,500,000 |
1,007,000,000 |
948,500,000 |
| Earnings before Income Taxes |
103,200,000 |
100,300,000 |
290,400,000 |
264,700,000 |
| Automotive Retail International | Operating Segments |
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| Segment Reporting Information [Line Items] |
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| Revenues |
87,600,000 |
85,200,000 |
261,700,000 |
255,200,000 |
| Earnings before Income Taxes |
13,000,000 |
12,500,000 |
41,500,000 |
37,000,000 |
| Other |
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| Segment Reporting Information [Line Items] |
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| Separation costs |
600,000 |
0 |
34,600,000 |
0 |
| Other | Operating Segments |
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| Segment Reporting Information [Line Items] |
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|
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| Earnings before Income Taxes |
(33,700,000) |
(17,700,000) |
(110,100,000) |
(51,600,000) |
| Digital Marketing |
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| Segment Reporting Information [Line Items] |
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| Amortization of intangibles |
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15,600,000 |
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| Digital Marketing | Operating Segments |
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| Segment Reporting Information [Line Items] |
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| Revenues |
106,200,000 |
95,900,000 |
315,200,000 |
272,600,000 |
| Earnings before Income Taxes |
$ 10,900,000 |
$ 5,600,000 |
$ 14,900,000 |
$ 17,700,000 |