Schedule II - Valuation Accounts and Reserves (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at January 1		$ 1.6	$ 1.6	$ 1.6
Charged (Credited) to Expense
Deductions
Other	[1]
Balance at December 31		1.6	1.6	1.6
Deferred tax asset valuation allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at January 1		305.4	294.4	306.5
Charged (Credited) to Expense		18.6	25.7	40.8
Deductions
Other	[1]	152.3	(14.7)	(52.9)
Balance at December 31		$ 476.3	$ 305.4	$ 294.4

[1] Amounts in 2017 and 2016 for deferred tax asset valuations are primarily associated with an increase in foreign tax credit carryforwards. The amount in 2015 for deferred tax asset valuation allowance is primarily associated with utilization of foreign tax credit carryforwards.