Schedule II (Details) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Trade Accounts Receivable [Member] |
|
|
|
|
| Valuation and Qualifying Accounts and Reserves [Roll Forward] |
|
|
|
|
| Balance at Beginning of Period |
|
$ 1.7
|
$ 2.1
|
$ 3.1
|
| Additions, Charged to Income |
|
(0.1)
|
0.9
|
0.8
|
| Additions, Other Charges |
|
0.0
|
0.0
|
0.0
|
| Deductions from Reserves |
[1] |
0.7
|
1.3
|
1.8
|
| Balance at End of Period |
|
0.9
|
1.7
|
2.1
|
| Finance Receivables – Long-Term [Member] |
|
|
|
|
| Valuation and Qualifying Accounts and Reserves [Roll Forward] |
|
|
|
|
| Balance at Beginning of Period |
|
0.0
|
0.0
|
0.0
|
| Additions, Charged to Income |
|
0.0
|
0.0
|
0.0
|
| Additions, Other Charges |
|
0.0
|
0.0
|
0.0
|
| Deductions from Reserves |
[1] |
0.0
|
0.0
|
0.0
|
| Balance at End of Period |
|
0.0
|
0.0
|
0.0
|
| Deferred Tax Assets [Member] |
|
|
|
|
| Valuation and Qualifying Accounts and Reserves [Roll Forward] |
|
|
|
|
| Balance at Beginning of Period |
|
66.5
|
60.0
|
43.0
|
| Additions, Charged to Income |
|
3.5
|
6.5
|
17.0
|
| Additions, Other Charges |
|
0.0
|
0.0
|
0.0
|
| Deductions from Reserves |
[1] |
0.0
|
0.0
|
0.0
|
| Balance at End of Period |
|
$ 70.0
|
$ 66.5
|
$ 60.0
|
|
|