Fair Value (Fair Value Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Total Assets	$ 3.4	$ 4.0
Total Liabilities	3.0	1.1
Available-for-sale Securities [Member]
Available-for-sale securities	2.8	2.8
Foreign Exchange Contract [Member]
Foreign exchange forward contracts, assets	0.6	1.2
Foreign exchange forward contracts, liabilities	3.0	1.1
Level 1 [Member]
Total Assets	2.8	2.8
Total Liabilities	0.0	0.0
Level 1 [Member] | Available-for-sale Securities [Member]
Available-for-sale securities	2.8	2.8
Level 1 [Member] | Foreign Exchange Contract [Member]
Foreign exchange forward contracts, assets	0.0	0.0
Foreign exchange forward contracts, liabilities	0.0	0.0
Level 2 [Member]
Total Assets	0.6	1.2
Total Liabilities	3.0	1.1
Level 2 [Member] | Available-for-sale Securities [Member]
Available-for-sale securities	0.0	0.0
Level 2 [Member] | Foreign Exchange Contract [Member]
Foreign exchange forward contracts, assets	0.6	1.2
Foreign exchange forward contracts, liabilities	$ 3.0	$ 1.1