Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue, Major Customer [Line Items]
Total operating revenues	$ 1,355.8	$ 1,192.6
Deferred Revenue	60.4		$ 60.4
North America [Member]
Revenue, Major Customer [Line Items]
Total operating revenues	818.0
EMEA [Member]
Revenue, Major Customer [Line Items]
Total operating revenues	469.9
Asia Pacific [Member]
Revenue, Major Customer [Line Items]
Total operating revenues	$ 67.9