Schedule II (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Trade Accounts Receivable [Member]
Valuation and Qualifying Accounts and Reserves [Roll Forward]
Balance at Beginning of Period		$ 1.1	$ 1.1	$ 1.0
Additions, Charged to Income		1.6	1.8	1.3
Additions, Other Charges		0.0	0.0	0.0
Deductions from Reserves	[1]	1.7	1.8	1.2
Balance at End of Period		1.0	1.1	1.1
Finance Receivables – Long-Term [Member]
Valuation and Qualifying Accounts and Reserves [Roll Forward]
Balance at Beginning of Period		0.6	0.6	0.6
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		0.6	0.6	0.6
Deferred Tax Assets [Member]
Valuation and Qualifying Accounts and Reserves [Roll Forward]
Balance at Beginning of Period		22.1	8.0	2.4
Additions, Charged to Income		9.5	14.1	5.6
Additions, Other Charges		0.0	0.0	0.0
Deductions from Reserves	[1]	0.0	0.0	0.0
Balance at End of Period		$ 31.6	$ 22.1	$ 8.0

[1] Includes uncollectible accounts written off.