Intangible Assets and Goodwill - Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Amortizable intangible assets [Line Items]
Carrying Amount	$ 397.0	$ 232.1
Accumulated Amortization	101.6	89.5
Customer relationships
Amortizable intangible assets [Line Items]
Carrying Amount	368.7	203.6
Accumulated Amortization	81.8	71.0
Other
Amortizable intangible assets [Line Items]
Carrying Amount	28.3	28.5
Accumulated Amortization	$ 19.8	$ 18.5